Vertical forms in Bootstrap 3 should still use the control-label class.

Currently, if you have a vertical form and have errors, the labels aren't styled red due to them missing the .control-label class. It only works on horizontal forms since they have the class. Inline forms should not have the class, still.
Merge pull request #227 from andrewryno/twbs3-label-class

Vertical forms in Bootstrap 3 should still use the control-label class.