some spelling-fixes

fix: correct spelling "Medaille", votings are "received votings"
Update header.css.scss

Zwischenstand
Merge pull request #170 from MatthiasApsel/master

some spelling-fixes
fix #171: use correct path helper
FEAT: ignore query string args when value is nil
bundle update
fix: we no longer use bootstrap
ADD: new jquery plugin for setting cursor positions
FEAT: set cursor to a nice position

Set cursor to the first empty field or, if none empty, to the content
textarea. Within the content textarea, set it to the first quoting
character; we assume that in most cases you don’t need to change the
greeting.

Closes #156
reindent

ruby-mode for Emacs 24.4 change its indenting behaviour.
FEAT: implemented retagging

Closes #84
fix: check if tags are valid on update, too
fix: link retag action if user has right to do so
FEAT: list hidden threads an unhide them

Closes #162
fix: use correct variable name
renamed file to match file name conventions
FEAT: moved code for getting messages from the main page to a helper
FEAT: new hook for marking all threads as read

Closes #161
fix: show connection state in new layout
FEAT: add a user authentication token for websocket connections