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 alerts now dismissable
Include actions; slim treats indented lines as commented out.
Latest simple_form generates a slightly different initializer.
Merge branch 'felafelwaffle-felafelwaffle-use-bootstrap-button-icons'