Create search REST endpoint
Add indexing of songs into elasticsearch
Add REST endpoint for song search [title, album, artist, year]
 - implement library with basic search functionality with elastic search
 - fixed minor code errors
 cleanup search code
fix html
remove unnecessary require
moved elastic search reindexing to www
made host config of elastic search configurable
escape special characters for elastic search
remove unnecessary comment
  - updated elastic search settings to match our environment
  - set elastic search output to 'info'
  - removed unnecessary 'pretty' property
Merge remote-tracking branch 'origin/features/proper_player' into feature/elasticsearch_v3

Conflicts:
	routes/song.js
created domain objects module for frontend and added song domain object
separated player templates
moved global Array prototype extension to global.js file
Adjusted menu entry priority for the library
added styling for page-header
moved player configuration in its own config.js file
moved upload config in its own config.js file
remove unnecessary brackets
move global array function for songs and replace it with a local function