FIX(share) fix notification avatar

- fix notification avatar

Closes #133
Merge branch 'master' of github.com:Gisto/Gisto

* 'master' of github.com:Gisto/Gisto:
  FIX(share) fix notification avatar
IMPROVE (node-webkit): Add check if running in node-webkit to execute
node-webit only code and removed analytics debug mode.