Complete test coverage by testing with a real Django Q object.

[donkirkby]

I don't know if there was a reason for mocking out the Django Q object and calling filter_q(), but this gets us to 100% test coverage and didn't cause any problems that I could see.

[codecov-io]

Current coverage is 100% (diff: 100%)

Merging #19 into master will increase coverage by 0.99%

@@             master   #19   diff @@
=====================================
  Files             5     5          
  Lines           303   303          
  Methods           0     0          
  Messages          0     0          
  Branches          0     0          
=====================================
+ Hits            300   303     +3   
+ Misses            3     0     -3   
  Partials          0     0          

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[stphivos]

Thanks! Yes there was a reason but not a very good one. I wanted initially to unit test all MockSet methods in isolation but since filter_q is "private" and not a real QuerySet method maybe it makes more sense to test it through the filter interface.