Fixed conflict with BS error class (fixes #263)

Renamed the error class added for global errors as this conflicts with BS error rendering. See #263 for details.
Change column size of widget if label is false

https://github.com/braincrafted/bootstrap-bundle/issues/265
attempt to clarify bootstrap licensing post 3.1

Feel free to use totally different text, just thought i'd get it out there.
Added PHP 5.6 and HHVM to travis.yml
In a "bootstrap-collection", if you set an attr "style" and "class", the class style of the "class" attr will be stuck without space
Add help text to single checkbox and radio
add additional class for icons

Hi, 

I would like to use the stacking of icons like in http://fortawesome.github.io/Font-Awesome/examples/#spinning

-> to do that I added a way to define an icon like .icon-cog+spin
Merge pull request #271 from Nyholm/patch-1

Added PHP 5.6 and HHVM to travis.yml
Merge pull request #267 from jrobeson/patch-1

attempt to clarify bootstrap licensing for 3.1 and beyond
Merge pull request #264 from althaus/patch-1

Fixed conflict with BS error class (fixes #263)
add newline for PSR-2
remove not needed escape char
Merge pull request #281 from wodka/patch-1

add additional class for icons
Merge pull request #275 from bostaf/help-text

Add help text to single checkbox and radio
Merge pull request #274 from bdm-benzor/develop

bootstrap-collection
Merge pull request #266 from jeroenvds/patch-1

Change column size of widget if label is false
Update BootstrapIconExtension.php

make icon tag configureable
Update BraincraftedBootstrapExtension.php
Update Configuration.php
Update twig.xml