Fix exception when a symbol is used on :greater_than validator
Fix exception when a symbol is used on :greater_than_or_equal_to validator
Fix exception when a symbol is used on :less_than validator
Fix exception when a symbol is used on :less_than_or_equal_to validator
Extract case statements on validations module to a private method
we seem to need bundler exec to run in Travis now
Try Ruby 2.1 instead of 2.1.0 or 2.1.1

This was suggested due to a bug in travis-ci/travis-ci#2220

Conflicts:
	.travis.yml
Merge pull request #1034 from justinfrench/sobrinho-fix-numericality-validator

Fix exception when a symbol is used on numericality validator