Added script/delayed_job which manages a deamon for working off jobs

Run `script/generate delayed_job` to generate the script
Added capistrano tasks for managing the delayed_job process
fix description for cap restart task
Clear active AR connections in the background script so it picks up the new logger.
Added script/delayed_job which manages a deamon for working off jobs

Run `script/generate delayed_job` to generate the script
Added capistrano tasks for managing the delayed_job process
fix description for cap restart task
Clear active AR connections in the background script so it picks up the new logger.
Updated command to use Delayed::Worker
Merge commit 'tobi/master'
Merge branch 'daemon'

Conflicts:
	generators/delayed_job/templates/script
	lib/delayed/command.rb
Added ability to run multiple workers concurrently.
Change working directory to RAILS_ROOT when starting the daemon process
Set RAILS_DEFAULT_LOGGER before loading Rails in the command line script
Revert "Set RAILS_DEFAULT_LOGGER before loading Rails in the command line script", since we lose the log level by doing it this way

This reverts commit c43dba99dbe902c8b0629ae319c4041416d7caea.
Fix spelling errors
Add migration to the default generator
Use :text for the last_error field
Fixed so that backing off after failures is respected by other workers
Added Rakefile with Jeweler for generating the gemspec