Revert "bootstrap3 migration, tIDENTIFIER error"

This reverts commit 616962277bfc404bd6456444cfd57efd8d603f6d.
bootstrap 3 mass-upgrade!
forms also likes boostrap 3
Smaller search field in navbar
Collapsable navbar
added metatag for proper mobile rendering
Layouts got metatag for responsive view
remove unresponsive css-code
create discussion form fix + misc fixes
discussion form responsiveness attempt
max-width:100em
vote-buttons height=>40px
added sass-gem with version < 3 to avoid known bug
gemfile update
height
attempt fixin thumb-sizes
margins on hands
Z-index solved link issue on resize
enabled all the stylesheets