(maint) migrate deprecated jquery calls

Prior to this commit, Dashboard was attempting to call .live, which had
been deprecated in jQuery 1.7 and completely removed in 1.9. This commit
updates these calls to the semantically equivalent .on method.
(maint) update colorbox & livequery jquery plugins

Prior to this commit, the versions of colorbox and livequery plugins
were not compatible with jquery 1.9. This commit updates each of them
respectively.
(maint) remove root object wrapper in json

Prior to this commit, the query calls for node_classes and node_groups
would include the root object as a layer of indirection, which causes
the live query plugin to barf.  This commit removes that root object
from all ActiveRecord objects serialized to json.
Merge pull request #190 from jeffweiss/might_i_offer_a_suggestion

(rails3) Fix autosuggest for classes and groups