References related models so we can run test files individually
Merge branch 'master' of https://github.com/mde/model
Merge branch 'master' of https://github.com/mde/model
Fixing present validation
Fixing present validation with empty string checking
Merge branch 'master' of https://github.com/mde/model
Merge pull request #45 from ben-ng/master

Add test for required integer value of zero
Merge pull request #43 from lgomezma/master

Fix present validation check
Include null as non-value for validatesPresent
Version 0.0.39
Fixes issue #42: Required integer values of zero not accepted