Added rspec test for og in status_message model

Added rspec test for og_html helper

Improved tests for opengraph embedding

deletes ActivityStream model and all it's references

update migration with the without_protection option to disable mass assignment protection

markdown link to their profile (fixes #2516)

add failing spec for #4160 / #2516

extend the spec a bit more

refactor mention handling in a status message

add method for filtering mentions by aspects

wire mention filtering into the status message model, adapt a few tests to
work properly

cosmetic changes

shorten helper methods

add changelog entry

* Throw away old system
* Add new system
* Add new example files
* Replace all calls
* add the most important docs
* Add Specs
* rename disable_ssl_requirement to require_ssl
* cloudfiles isn't used/called in our code
* since community_spotlight.list is only used as enable flag replace it with such one and remove all legacy and irelevant codepaths around it
* die if session secret is unset and on heroku
* First basic infrastructure for version information

This reverts commit c52342b7.

commit. Add migration and rake task to copy hidden information from
share_visibilities to users. see: http://devblog.joindiaspora.com/?p=44

removed Photo#not_processed

MS DG IZ major invite refactor. all tests are green minus weird stuff on dans computer, need to checkout this out on pivots