support rails 4.0 and 4.1
Merge branch 'master' into commit-to-rails-40-41

Conflicts:
	.travis.yml
update jack_hammer to support 4.1
remove unused code
make these things strings so that postgres doesn’t have a heart attack
Merge pull request #5 from envato/commit-to-rails-40-41

Support rails 4.0 and 4.1