closes #6118

* Bump sass-rails (without effect)
* Bump mobile-fu (without effect)
* Cosmetically fix two cukes
* Refactor Taggable#tag_strings
* Rename default.css to default.css.scss (without effect)
* Fix receiving a conversation
* Pass aspect_ids instead of a relation to User#aspects_from_ids

invalidate empty posts when created by a local user

add changelog entry

* removed wait_until where possible
* replaced wait_until with DOM obersavtions
* added match: :first to all finders that assumed getting the first element
* replaced evaluate_script with execute_script where possible
* replaced a few execute_script with DOM observations through Capybara
* removed sleep where possible
* replaced sleep with DOM obersvations
* replaced "wait for ajax" with DOM obersavations
* replaced alert confirmation with new selenium API
* bump selenium webdriver
* made any other fixes to get green again

A lot of cleanup is still needed, refactoring the CSS to be consistent, removing all sorts of unused stuff etc

fixed scoping stuff

Issue #1126 - When the last photo is deleted from the publisher, we now collapse the publisher if no status text had been entered.