Feature/range requirements

[stphivos]

• Add support for model_mommy 1.3.2
• Update model-mommy req
• Generate range requirements to a separate file

Includes PR #44

[codecov-io]

Codecov Report

Merging #45 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #45   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           6      6           
  Lines         674    674           
=====================================
  Hits          674    674

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