standardised installer bootstrap buttons
standard bootstrap button classes
Merge pull request #1279 from rojblake/installer_bootstrap

standardised installer bootstrap buttons
remove use of deprecated exceptions in AbstractBase. Fixes issues with argument order/type
standardised pagerabc look and feel
Minor look and feel fix for new newuser.tpl
styled user import/export buttons
Merge pull request #1281 from rojblake/pager_fixes

standardised pagerabc look and feel
Merge pull request #1282 from rojblake/users_fix

Minor look and feel fixes for users module
Merge pull request #1280 from craigh/abstractbasefix

remove use of deprecated exceptions in AbstractBase.
Deprecate exceptions thrown in helper methods.
Return a RedirectResponse directly instead!