Change css to have new student node names (needs to be removed).
Fix some typos in example JSON
Move more node creation stuff into addNode so that
Create Node button will open node editor.
Remove modules "node.js" and "student_node.js"
since creating a new node is more naturally a
part of addStudentNode.
Remove extra getters and setters that are not
needed (or are trivial) if node ids never change.
poping up Input fields in Node Editor
Changes to the json format.
Add "id", "name" and "units" to the extraDescriptions
Name changes:  correctDesc -> description and studentSelections -> selections
Merging changes; added addNode() function to given object.
adding input fields to node editior
Merge branch 'master' into megha2

Conflicts:
	www/index.html
Updated model.js
Merge branch 'master' of https://github.com/rptiwari/LaitsV3
More fixing up js/model.js accessor functions.
Now have ability of add methods that are common to
both student and given models.
Fix variable name error.
Finished adding getters to build model.js after changes; additional changes to test code.
Skeleton for function to handle PM repies.
Erased functions that were moved to obj section; fixed setToDemo().
Merge branch 'master' of https://github.com/rptiwari/LaitsV3
Re-do changes to fix model.
Minor changes to pedagogical_module.js.