Refactored youtube searching and daily top searching.
Added response-fail-message to youtube-search. Refactored soundcloud-player-setup.
Refactored playlist-deleting method.
Refactored createProfile.
Merge branch 'refactor-ajax-methods'

I refactored JS methods that use Ajax calls.
Instead of having request-sending and response-processing in separate functions,
I placed them both in their main method.