Tests commit for database
removes Legende-String
Merge branch 'master' of https://github.com/Datenbankpraktikum2013/Datenvisualisierung
Adds error message if result is empty
Adds "All year" option to timesilder
Merge branch 'master' of https://github.com/Datenbankpraktikum2013/Datenvisualisierung
Adds ability to prepend alert message to a specific element
Improves slider animation controls
Abschlussart auswählen is now multiselect
Cleans up animator.js
Merge branch 'master' of https://github.com/Datenbankpraktikum2013/Datenvisualisierung
Merge branch 'master' of https://github.com/Datenbankpraktikum2013/Datenvisualisierung
Fixes problem with gender filter
selecting only students id and not the whole student in first row of join_classes method for way better performance
Merge branch 'master' of https://github.com/Datenbankpraktikum2013/Datenvisualisierung

for better performance
Adds comments for use/ignore-index test
Merges search
Adds index to student_id in studies.
Adds index to (discipline_id, study_id) in disciplines_studies.
Adds index to teaching_unit_id in disciplines.