Completed problems for physics teacher (Steve Eno).
Fixed equation export issue in author mode
Merge branch 'master' of https://github.com/rptiwari/LaitsV3.git
Make test for undefined nodes, Bug #2159.
renamed method to notAllNodesDefined
Merge with Ram's changes for Bug #2159
Merging straight onto master, since there is a deadline.
xml updates
Merge branch 'master' of https://github.com/rptiwari/LaitsV3
xml changes for kurt
Disabled check and demo buttons when user checks correct answer (turns the node editor inputs green). Problem Kurt needed fixed asap. Reid checked code.
remove redundant check
Resolved bug 2157. Created new files with previous code. XML was deprecated. Removed code that was preventing files from working on dragoon. Also removed errors that prevented user from completing problem.
Merge branch 'master' of https://github.com/rptiwari/LaitsV3.git