Bug Fix 2271 - cherry-picked from sita d95e01a8

Conflicts:
	src/edu/asu/laits/gui/ExportSolutionPanel.java
Bug Fix 2266 - cherrypicked from sita d6e21565

Conflicts:
	src/edu/asu/laits/model/PersistenceManager.java
light bugfixes
Merge branch 'master' of https://github.com/rptiwari/LaitsV3
MVC work (in progress)
Merge
Additional MVC work (in progress)
MVC work, load and save JSON formatted string, etc.
Additional MVC work.
Files to build and access complete model. Continuing to improve code. Object.php shows the model in use both to load a JSON formatted string and to build a model from scratch.
linked Megha's Node Editor Code with UI
Improvements to MVC (in progress)
Improvements to the MVC.
Merge branch 'master' of https://github.com/rptiwari/LaitsV3
Merge branch 'sachin'
Merge branch 'sachin'
MVC controller improvements.
Merge branch 'master' of https://github.com/rptiwari/LaitsV3
Merge branch 'sachin'
Merge branch 'master' of github.com:rptiwari/LaitsV3