Document edit capability via ProseMirror submodule #974

+ New docEdit page with links from docPage and docList
+ Bespoke menu system with full screen edit mode
+ npm required for building client side scripts
+ Ant script added for BuildUI which performs npm commands
+ Update font-awesome to 4.5.0
+ Factor out to JGitUtils common code in BranchTicketService for EditFilePage
	+ getTreeEntries
	+ commitIndex
+ Merge capability for document editing
25 files changed