bootstrap 3 compatibility fixes and use icons with all scaffold buttons

- updated some old bootstrap css classes to bootstrap 3 standards
- helpers to easily create bootstrap 3 glyphicon buttons
- scaffold templates now include glyphicon buttons
- standard bootstrap alert containers now dismissable
- :copyright:  year in footer now dynamic  
- only made these changes to the rails 4 template since the rails 3 template has not been updated to bootstrap 3

if you don't want the icon stuff I can re-create with just the bootstrap 3 css fixes!