DEV: autogenerated staticfiles dir added to .gitignore

Autogenerated from collectstatic dir is ignored.
DEV: MEDIA_URL changed to STATIC_URL

MEDIA_URL has been used till now to serve static files.. From this commit, we use STATIC_URL

Reasons:
1. we can use collectstatic command to transfer staticfiles to static_root
This easy to maintain in production servers
DEV: MEDIA_URL to STATIC_URL for serving static files

1.  static_url offers collectstatic command to collect static files at static_root - useful in production servers
2. The staticfiles directory /deploy/media has not been changed to /deploy/static --
Possibly, its not required technically. May be we can shift if really needed.
Merge branch 'media-to-static' into design-1.0