Allow reading scripts from an anonymous pipe

Bash (and many other shells) provide a nifty feature in "anonymous pipe" or "anonymous fifo" whereby the output of a subshell may be treated as a simple file by the parent shell: http://unix.stackexchange.com/a/156088

Unfortunately, libmproxy complains because that "file" is not a regular file, as os.path.isfile checks, e.g. giving the error "Not a file: /dev/fd/11". This patch is intended to provide for the following use-case:

```
mitmdump -s <(echo "def response(context, flow):\n  flow.response.headers['newheader'] = [`hostname`]")
```

where `hostname` may be replaced with a more complicated lookup.

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