member_post and membership has a many-to-many relationship

also:
  - added permissions
  - test for permission#ability validations
added cancan for authorization

also:
  - added and set up factory_girl for test data creation
  - added some factories
members can update themselves and can manage their jobs
added spork gem to speed up test load time

updated readme with instructions on how to test
tests for the existing abilities for Members and JobPositions
membership has many member_posts.

member_posts are not reusable, because they hold specific
information about the that post (eg. when does it end)
annotated models with db structure
added permission factories
controllers are now using their own js and css files
controller + view for creating MemberPosts
Ability got extended with using groups for authorization
member_posts_controller authorization
removed rake file for testing with spork

updated readme
fixed authorization order: cancan first, user defined later

upgraded rails to 3.2.11
added mocha to the mix
removed coffeescript, adjusted existing js files
listing of member posts for a given membership
a permission now can have more than one ability

rewrote the whole thing bacause it was a pain to maintain
view and action for editing MemberPosts
memberpost can be marked deleted now

added empty css file for member_posts controller
added seed data: membership and "körvezető" post
listing posts on the group page