Fix validator version to 2.1.x.

VeryModel is incompatible with the just-released validator 3.0.0.
Merge pull request #18 from latentflip/patch-2

Fix validator version to 2.1.x.
bump version 1.4.5
Merge branch 'master' of github.com:aaronmccall/VeryModel
version bump to 1.5.0 due to changed API