change FilterSet to invoke form errors and skip filtering on invalid data, returning empty queryset with strict mode
Failing test cases for filtering an integer against 0.
Fixed the bug where filtering an integer against 0 returned the full query set.
Merge pull request #105 from linovia/develop

Filtering against 0 returns the full queryset
Fixed support for newer wheel versions.
Disable python 2.6 on tests against Django master.
Fixed tests for Django 1.6/1.7.
change default value for strict to True, and hopefully made the code for filtering with invalid values clearer (also removed _SENTINEL)
- need to differentiate between actual 'None' value and a ValidationError
- grab order_by value in for loop, avoids double lookup and eliminates need for get_value function
fix a few tests due to defaulting strict = True
Merge branch 'develop' into nkryptic-issue-84
Merge pull request #108 from apollo13/issue-84

Issue 84
keep example FilterSet class name consistent
explain the "strict" FilterSet option in the docs...created subsection to make it clearer it isn't a Meta option
Merge pull request #109 from whitews/develop

update docs to explain 'strict' FilterSet option