Add initial version of Bootstrap 3
Convert template files to bootstrap 3 using conversion tool

https://github.com/arjan/bootstrap3-upgrader/blob/8c03b889d8c90093e4c4180b83940d1930f366d2/upgrade.py
Fixes, upgrade tool dba1246
Manual work
WIP
Move admin CSS into LESS file; work on styling; fix admin widgets
Admin edit page tweaks, dialog
WIP on template checks for all modules
More work on admin pages
More forms in dialogs fixed
Misc fixes
Work on editing blocks, i18n
Navbar CSS
Bootstrap3 zotonic_status site