added uploader
fixed posts controller
fixed posts/show
added basic post pictures uploading
added date to picture name
changed picture cache dir
Merge branch 'pictures' into develop

* pictures:
  changed picture cache dir
  added date to picture name
  added basic post pictures uploading
  added uploader

Conflicts:
	Gemfile
	Gemfile.lock
	db/schema.rb
fixed comment saving
Merge branch 'fix_nested_comments' into develop

* fix_nested_comments:
  fixed comment saving
  fixed posts/show
  fixed posts controller