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Signed-off-by: Lukas Matt <lukas@zauberstuhl.de>

and refactor coding style according to pull request comments

(#5324)

and correct test syntax
#5324

(#5324)

* thanks to @maxwell for the initial work on this

port admin pages to bootstrap
* improve user view on admin search page
* add 'close account' link to each user in the search results
* keep the same blue color for the admin menu

some refactoring of the routes and the admin code
* try to be more RESTful (possibly)
* use a 'UserSearch' model for search parameters and querying

add changelog entry

* changed user_id type to integer
* renamed post_id to item_id
* renamed post_type to item_type

Instead of checking the status code I am using success and
error callbacks from model-save. In that case we have to return
json in the controller for signaling that the request was sucessfully.

* join the conditions of the inner ifs
* add a uniqueness constraint to the model
* differentiate between author is a local or a remote user
* simplify controller/mailer functions

* Renamed PostReport to Report
* Added report button to SPV
* Updated rspec

refs diaspora/diaspora#4732
refs diaspora/diaspora#4710
refs diaspora/diaspora#4711
refs diaspora/diaspora#4517