Merge pull request #63 from benoitf/IDEX-367

IDEX-367 and IDEX-368 : Allow to use guide on client side for injecting ...
IDEX-379 add tutorial for theme api
Merge remote-tracking branch 'origin/master'
Move icon registartion to client side
Merge branch 'master' of https://github.com/codenvy/ide into IDEX-367