Added color to the quite mode summary. Also changed the output format
slightly to match the output of the standard summary.
argcomplete: FastFileCompleter that doesn't call bash in subprocess, strip prefix dir



```
timeit result for 10000 iterations of expanding '/d' (lowered the count in the code afterwards)
#                      2.7.5     3.3.2
# FilesCompleter       75.1109   69.2116
# FastFilesCompleter    0.7383    1.0760
```
- does not display prefix dir (like bash, not like compgen), py.test /usr/<TAB> does not show /usr/bin/ but bin/
Merged in pelme/pytest/quiet-color-summary (pull request #61)

Added color to the quite mode summary
Merged in anthon_van_der_neut/pytest_argcomplete (pull request #63)

argcomplete: FastFileCompleter that doesn't call bash in subprocess, strip prefix dir
a new monkeypatch.replace(target, value) call which derives the
monkeypatch location from target (can be class/module/function or
string which is taken as importable python path)
examples:

    monkeypatch.replace(os.path.abspath, lambda x: "")
    monkeypatch.replace("requests.get", ...)
monkeypatch.replace() now only accepts a string.  Improved error handling and
docs thanks to suggestions from flub, pelme, schmir, ronny.
remove automatic tox-testing of py25
mention pytest_collection_modifyitems in plugin page
add a note about how a lightweight but more powerful function-mocker could be done
(compared to standard mock).
strike distribute dep