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

* Dropped all references to Resque
* Moved all jobs under app/workers since that's the Sidekiq convention
* Renamed Jobs module to Worker to match new location
* Adapted all jobs to Sidekiq
* Replaced all enqueue calls with perform_async
* Dropped Resque hacks from specs and features, replaced with
  sidekig/testing in RSpec and sidekig/testing/inline in Cucumber
* Updated scripts to start a Sidekiq server
* Inline Sidekiq sinatra app
* Let Sidekiq create the actual Redis instance
* Workaround already initialized constant warnings in service models
* Resolved ToDo in one job definition by creating proper exception clases
  for some errors in receiving posts
* Added sidekiq section to configuration to make it completly
  configurable to the user
* Add Sidekiq middleware for clean backtraces
* Delay HttpMulti retry to give offline pods a chance to come back up
* Do not retry on GUID already taken and alike errors
* Be graceful about deleted posts in GatherOEmbedData

* 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

- `Rails.root` is a `Pathname`, so let's use `Rails.root.join`
- Clean up most of the remaining `File.join`s

This reverts commit c52342b7.

... when running with 1.9.3 everything's peachy :/

MY FIRST COMMIT <3 (it would be so awesome if this would make travis green)
:P

-> https://makandracards.com/makandra/950-speed-up-rspec-by-deferring-garbage-collection

on my machine the rspec tests went from taking 5min 02sec to 3min 29sec :O
(31% improvement)

This reverts commit 8507dc86.

This reverts commit 8507dc86.

you can now create a comment with User#comment!(post, text)

http requests).

Revert "retry less"

This reverts commit 7784156e.

Revert "supress resque retries"

This reverts commit 80cdcd4e.

Revert "Retry federation if remote pod is down"

This reverts commit bcbc86e5.

Conflicts:

	app/models/jobs/http_multi.rb

refactor of the redis_cache class

simplify multi-server spec running with foreman.  couldn't really get it automated tonight, not sure why.

dispatcher