badges added to README
pep8 code style cleanup
django 1.7, 1.6.7, 1.5.10 added to travis.yml
Requirements updated in requirements.txt and README.rst files.
cache selection fixed for django 1.7+
Exception handling for OperationalError replaced to DatabaseError
get_etag hash calculation TypeError fixed
ugettext should be lazy in settings
initial code for tests added
travis script updated
pep8 warnings fixed
version bump to 0.0.3