Added support for a custom position ratio
Added tests for catching bad custom position ratios
Fixed typos in README file
Added a test for valid position ratios in the image test suite
Added pep8 and pyflakes checks to Travis and vagrant install, corrected errors reported by pep8 and pyflakes
Fixed typo in travis configuration
Merge remote-tracking branch 'upstream/master' into feat-implement-crop-functionality

Conflicts:
	pilbox/app.py