All JS Files now call 'requirejs' instead of 'require', also
the holder.js reference is removed and the history api added.
Tests are following in the next commit
refs #4303
refs #4315
Behaviours are now modules and icinga.js automatically
requests module/list (which should be served by the application
and is non static) and retrieves a list of modules to request and
enable.
refs #3753
Jannis Moßhammer
Eric Lippmann
Marius Hein