Squashed commit of the following:

commit edfbd41200a854f0bb7bb99f8bb70af9dbb9b8e0
Author: Matt Weidner <matt.weidner@gmail.com>
Date:   Tue Jul 25 01:19:53 2017 -0500

    Extended view.load test to check for unhandled IOError exception.

commit a523b534bc59ea97ed1fd5a3e6f78112fee19b6f
Author: requires.io <support@requires.io>
Date:   Mon Jul 24 21:25:04 2017 +0200

    [requires.io] dependency update

commit c725540c6eb92c003616b649ba43bee1f14e56ac
Author: Thomas Kriechbaumer <thomas@kriechbaumer.name>
Date:   Mon Jul 24 21:01:25 2017 +0200

    update travis

commit eeb6cfb4c76e60ac1813b839f589cd489c041c6c
Author: Thomas Kriechbaumer <Kriechi@users.noreply.github.com>
Date:   Mon Jul 24 21:03:14 2017 +0200

    [requires.io] dependency update on master branch (#2435)

commit 51a2672c782ee8ba8c7d5c7116073feccb4d8430
Author: Maximilian Hils <git@maximilianhils.com>
Date:   Mon Jul 24 19:03:01 2017 +0200

    require latest mypy version (refs #2452)

commit 5685a4850af6edda7100cae900487955c8b7a3ab
Author: Maximilian Hils <git@maximilianhils.com>
Date:   Fri Jul 21 11:24:42 2017 +0200

    fix addon tracebacks

    `.tb_next` discards the first interesting frame,
    this shouldn't happen.

commit a2da9b6c02030293f3a412d16df819868c581a29
Author: Matt Weidner <matt.weidner@gmail.com>
Date:   Sat Jul 22 12:30:15 2017 -0500

    Added os.path.expanduser() before open() calls with user supplied paths

commit 05db6e32c7957f267e97c34aa8f5a3cd6cb7dbb2
Author: Matt Weidner <matt.weidner@gmail.com>
Date:   Fri Jul 21 16:25:16 2017 -0500

    Added support for the ~ path shortcut when loading flows from disk.
    for consistency. Saving flows supports using paths with the ~ shortcut.

commit b7f864b6bbd221093aeb1c384dd16038f490441a
Author: Matt Weidner <matt.weidner@gmail.com>
Date:   Fri Jul 21 16:06:38 2017 -0500

    Fixed crash when loading flows from a file that does not exist

6 files changed, 20 insertions, 7 deletions

diff --git a/mitmproxy/addons/view.py b/mitmproxy/addons/view.py
index d4319468..b2db0171 100644
--- a/mitmproxy/addons/view.py
+++ b/mitmproxy/addons/view.py
@@ -10,6 +10,7 @@ The View:
 """
 import collections
 import typing
+import os
 
 import blinker
 import sortedcontainers
@@ -339,12 +340,17 @@ class View(collections.Sequence):
         """
             Load flows into the view, without processing them with addons.
         """
-        with open(path, "rb") as f:
-            for i in io.FlowReader(f).stream():
-                # Do this to get a new ID, so we can load the same file N times and
-                # get new flows each time. It would be more efficient to just have a
-                # .newid() method or something.
-                self.add([i.copy()])
+        path = os.path.expanduser(path)
+        try:
+            with open(path, "rb") as f:
+                for i in io.FlowReader(f).stream():
+                    # Do this to get a new ID, so we can load the same file N times and
+                    # get new flows each time. It would be more efficient to just have a
+                    # .newid() method or something.
+                    self.add([i.copy()])
+        except IOError as e:
+            ctx.log.error(e.strerror)
+            return
 
     @command.command("view.go")
     def go(self, dst: int) -> None:
diff --git a/mitmproxy/optmanager.py b/mitmproxy/optmanager.py
index e1d74b8e..c28ec685 100644
--- a/mitmproxy/optmanager.py
+++ b/mitmproxy/optmanager.py
@@ -518,6 +518,7 @@ def save(opts, path, defaults=False):
 
         Raises OptionsError if the existing data is corrupt.
     """
+    path = os.path.expanduser(path)
     if os.path.exists(path) and os.path.isfile(path):
         with open(path, "rt", encoding="utf8") as f:
             try:
diff --git a/pathod/language/generators.py b/pathod/language/generators.py
index 1961df74..70c6ad16 100644
--- a/pathod/language/generators.py
+++ b/pathod/language/generators.py
@@ -75,7 +75,7 @@ class RandomGenerator:
 
 class FileGenerator:
     def __init__(self, path):
-        self.path = path
+        self.path = os.path.expanduser(path)
 
     def __len__(self):
         return os.path.getsize(self.path)
diff --git a/pathod/pathoc_cmdline.py b/pathod/pathoc_cmdline.py
index 3b738d47..0854f6ad 100644
--- a/pathod/pathoc_cmdline.py
+++ b/pathod/pathoc_cmdline.py
@@ -208,6 +208,7 @@ def args_pathoc(argv, stdout=sys.stdout, stderr=sys.stderr):
 
     reqs = []
     for r in args.requests:
+        r = os.path.expanduser(r)
         if os.path.isfile(r):
             with open(r) as f:
                 r = f.read()
diff --git a/pathod/pathod_cmdline.py b/pathod/pathod_cmdline.py
index dee19f4f..c646aaee 100644
--- a/pathod/pathod_cmdline.py
+++ b/pathod/pathod_cmdline.py
@@ -215,6 +215,7 @@ def args_pathod(argv, stdout_=sys.stdout, stderr_=sys.stderr):
 
     anchors = []
     for patt, spec in args.anchors:
+        spec = os.path.expanduser(spec)
         if os.path.isfile(spec):
             with open(spec) as f:
                 data = f.read()
diff --git a/test/mitmproxy/addons/test_view.py b/test/mitmproxy/addons/test_view.py
index 40136f1f..e8eeb591 100644
--- a/test/mitmproxy/addons/test_view.py
+++ b/test/mitmproxy/addons/test_view.py
@@ -170,6 +170,10 @@ def test_load(tmpdir):
         assert len(v) == 2
         v.load_file(path)
         assert len(v) == 4
+        try:
+            v.load_file("nonexistent_file_path")
+        except IOError:
+            assert False
 
 
 def test_resolve():