Merge pull request #37 from buytruckload/add-module-documentation

add config block example to module documentation
Merge pull request #36 from buytruckload/better-time-zone-handling

make t an ActiveSupport::TimeWithZone instance
Remove tzinfo from clockwork.rb

It is implicitly dependended by ActiveSupport.  Do not remove from Gemfile and gemspec.
Version bump to 0.5.2
Regenerate gemspec for version 0.5.2
Merge remote-tracking branch 'upstream/master'