Merge pull request #53 from silent1mezzo/master

Documentation Typo
Ignore similar code warnings
Add custom managers to provide summary data
Version bumped for next release
Pin version of django-jsonfield for travis
Consolidate logic
Return charge object
Update version for next release
Convert decimal dollars into integer cents for Customer.charge()

Everywhere else in DSP we pull integer cents amounts
from the API and convert them into decimal dollars.
This was the only place where we were breaking from
that pattern and so it is best if we update to be
consistent and only expect/accept decimal amounts.
Bump version for next release
Ignore unused variable 'args'
updated management commands to use format and fixed 2.6 support
bumped version for next release