Make shift take parent column argument
Update specs
Bump version to 1.5.0.pre
Add Bower support

- Closes #121
Release 1.5.0
Remove extra comma in bower.json
Merge remote-tracking branch 'upstream/master'

* upstream/master:
  Remove extra comma in bower.json
  Release 1.5.0
  Add Bower support
  Bump version to 1.5.0.pre
  Update specs
  Make shift take parent column argument

Conflicts:
	bower.json