Many changes

Removed the content priority code as a domain object.
Began migration of  Knowledge Dimensions away from a domain object
Began work on content creation panel
Adding save capability to content tab
Adding KnowledgeDimensions

Added Knowledge Dimensions sub-dialog with informative image of current
dimensions selected
Finished Topic Modal

Topic Modal Dialog is finished
Included Error messages if no Knowledge Dimension selected
Calls populateTopics(Array topics) to interface with host page.
Renamed template
added tree to content subtab

Added the tree library to the content subtab and connected it to the add
topic dialog.
Altered the add topic dialog to only add new topics, not edit existing
topics
Styled tree

Added styling to tree, event listeners for movement and select boxes,
commented out ajax while getting tree to work
Finished Tree

Finished building the tree structure
Communicates to the back end.
Content and Learning Objective changes are saved
Merge remote-tracking branch 'origin/master' into LO-Content

Conflicts:
	grails-app/controllers/imodv6/LearningObjectiveController.groovy
	grails-app/domain/imodv6/ContentHierarchy.groovy
	grails-app/domain/imodv6/Imod.groovy
	grails-app/views/content/_graphView.gsp
	grails-app/views/content/_otherWidget.gsp
	web-app/css/source/learningObjective.main.gsp.css
	web-app/css/source/main1.css
Delete hierarchy
Fixed loading not showing checkmarks properly

Contents wasn't being saved properly to the db, rewritten to use GORM
properly
Merge pull request #87 from IMOD-ASU/LO-Content

Added Content subtab to the Learning objectives page
Merge branch 'master' of https://github.com/IMOD-ASU/imod into learning-objectives-performance-RiTa-wordnet