disabled password reset link for tabbing in login.html
translations
added category administration
Merge branch 'master' of https://github.com/Ratsmash-dev/RMash

Conflicts:
	app/views/session/login.html.erb
placeholder for login form
error message design bug fixes
Upladed logo

Hier mal ein logo Vorschlag und das R als icon datei im Imagefolder
css background bug fixes
added password changing for everyone
added placeholders to login form
deleted javascript placeholder
added logo to login page design
added reset password button
added dividing line to footer
increased test students to 132
downcast email
added groups for categories
concentrated migrations
outdated ER
descriptive addition