Merge pull request #85 from darkstar21/develop

couple small bug fixes and some documentation
adds nodeToAdd model to main scope
adds images for component library to workspace.directive
adds in drag-to-RR functionality(mocked in) and refactors DnD inside railroad-diagram. Very close to final functionality
adds in a few bug warnings
Merge pull request #86 from TessMyers/develop

Adds in decent drag-to-move functionality and mocked in add-from-library
(doc) edited comments on removeNode in modify tree factory
(fix) fixes bug with switching between text edit boxes
(fix) gets rid of infinite loop when adding to alternates
(fix) fixes some issues with dropping item near itself