Spring is the recommended application preloader for rails

If you try to connect from a secure connection
to a insecure connection; Most modern browser
block the request and flag it as mixed-content.

fixes #5254

Also relax the requirement. The .ruby-version represents
merely a recomendation for the Ruby version. The incompability
issues in the Ruby world are far less currently, than they were
when we introduced strict version enforcement. Thus strict
enforcement is no longer appropiate. Same holds for RubyGems.

This implicity also removes the recomendation on using RVM.
The .ruby-version file is supported by all major Ruby version
managers. Gemsets are no longer a needed feature since Bundler
handles multiple concurrrently installed Gems just well.

* It's broken for those that would benefit from it (postgres users)
* It's broken in the design: Reading it from the config requires bundle exec ruby, which requires it being set properly

Revert "bump recommended rubygems version"

This reverts commit e9526ee9.

See http://www.ruby-lang.org/en/news/2013/06/27/hostname-check-bypassing-vulnerability-in-openssl-client-cve-2013-4073/

the script is now split up in parts that will be fetched from github
on demand.
fixes #4047

* Made style consistent
* Add helper functions to print messages
* Abort script if critical command fails
* Made number of started Sidekiq workers configurable again

* 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

the day I decide to switch to seleniums prerelease 2.27 comes out. great. anyway, still two timeouts, any ideas? anyone?

This reverts commit 4cebe423.

* made configuration loader indepenent of rails
* corrected mismatch between example and default config (server.db/server.database)