Fixed bug with autosave not being when Node Editor
was called.  There was a race condition that was uncovered
when the controller constructor was moved in main.js
Work in progress for moving handlers to con-student.js
Enable/disable inputs and buttons following equation box enable/disable.
Fix bug in equation directives stuff.
If equation is demoed, still need to translate equation into
input variables and save in student model.
Still issue with conections being updated properly.
Rendering of table changed to accomodate accumulator sliders
Rendertable modification
converting equation to student readable format for PM messages, need to remove code for adding connection upon incorrect input
Add methods to determine if a parsed expression
is a product or a sum.  Add associated test page
     js/examples/parser.html
Merge with master
Adding a JSON problem with no accumulators.