Add option to control input width (that works)

Created by: cyberwombat

According to docs one would use .col-lg-x on the .form-group. While it does constrain the input field it also cause every subsequent element to float next to it so that is not a useable solution. Applying the .col-lg-x class to the input field themselves does not work. Currently the only workable solution is to use style="width:X" which is hardly wonderful. Please add a way to control input widths.