AppVeyor Windows continuous builds from condaci

This PR finally adds AppVeyor support to Menpo. This means for every commit on the master branch of Menpo we will now be getting fresh binary builds for the following for every platforms:

- Python 2.7 OS X 64bit*
- Python 2.7 Linux 64bit
- Python 2.7 Windows 32bit
- Python 2.7 Windows 64bit

Furthermore, we will be attempting to generate Python 3.4 builds for all the above platforms. This means as #419 is implemented we can track progress  and smoothly move to Python 3 as a supported Menpo option.

Finally, release builds are fully automated, so releasing new versions of Menpo going forwards is as simple as setting the git tag.

Note that in implementing this it was discovered that 3 tests are failing on Windows clients. Issue #450 has been set up to track this, and for now the tests have been removed from Windows to expedite getting this work in.

**Note:** *OS X builds are currently failing as OS X builds have not been regenerated for cyassimp and cyrasterize on OS X. This will be fixed in the short term via manual building on my laptop. In the long term we must wait for OS X support to come out of beta on travis before we can OS X builds of everything.