Return result of a deferred call

[SUNx2YCH]

In my custom matcher based on Raises I need a deferred call result to create a meaningful mismatch description (when there was no exception raised). That's why I think that DeferredCallable.__call__() should have a return statement.
I'm pretty sure that this change will not break anything.
Also I have removed a couple of unused imports.

[SUNx2YCH]

There is an issue with py32 env:
https://bitbucket.org/ned/coveragepy/issues/407/coverage-failing-on-python-325-using
Will try to fix it.

[SUNx2YCH]

It turns out that pip 8 also dropped support for Python 3.2: travis-ci/travis-ci#5485
That was the main reason of py32 env fail.

[offbyone]

I'm going to revisit Python 2.6 support before merging this. Probably do that this weekend.

[SUNx2YCH]

BTW, py32 env could be fixed by downgrading virtualenv and coverage:
https://travis-ci.org/SUNx2YCH/PyHamcrest/builds/112275490
I can create a pull request if you choose to continue with Python 3.2 support.

[offbyone]

Thanks, I'll just do the downgrade as part of the merge.

[offbyone]

Pushed as 1.9.0

[SUNx2YCH]

Thanks!

[coveralls]

Coverage decreased (-0.01%) to 96.085% when pulling d37dbc0 on SUNx2YCH:raises_fix into a9718b2 on hamcrest:master.