Add datashift gem
Merge branch 'master' of https://github.com/maxcobmara/uniformity into add-datashift

Conflicts:
	Gemfile
Merge latest
Update gem & add rake
Merge branch 'master' of https://github.com/maxcobmara/uniformity into add-datashift
Merge pull request #21 from izambasiron/add-datashift

Add datashift