Merge pull request #1 from cgallitz/release

refs #631 @0.1
Merge branch 'master' of github.com:cgallitz/webmasters-cms
refs #634 @0.2
 * column parent_page to page model added
refs #634 @1.0
 * parent page can now be saved in a page
fixed #634 @2.5
 * parent pages are saved
 * a page can not be a its own parent page anymore
 * specs added
refs #635 @0.75
 * installation of awesome_nested_set gem
refs #635 @0.50
 * migrations for awesome_nested_set
refs #635 @2.0
 * parent page is choosable and nested sites are shown
fixed #635 @1.5
 * admin page index renders dynamic list of all sites with children
refs #635 @0.01
 * fixed typo
refs #635 @0.25
 * feature tests for nesting
fixed #636 @2.5
 * parent page selection now shows pages tree
 * moving pages to an other parent
refs #637 @8.0
 * installation of drag&drop for index
refs #637 @3.0
 * EOD commit
refs #637 @1.5
 * tree is saved after drag&drop
refs #637 @2.0
 * Errorhandling
 * specs for update_parents
fixed #637 @0.5
 * cleanup of javascript
refs #637 @1.0
 * controller specs for put #sort
refs #638 @1.5
 * Installation of acts_as_versioned_jw
refs #638 @2.0
 * switched gem