add region config option, use boto.s3.connect_to_region
formatting fixes
update boto version for tests
Merge branch 'master' of github.com:e-dard/flask-s3 into wercker

Conflicts:
	flask_s3.py
Cache busting using file hashes as query strings
Test for cache busting
Merge branch 'cache-busting' of github.com:andrewsnowden/flask-s3 into wercker