Add subclass "givenExtra" to model accessors, including an example.
Move styling for node editor into css/dragoon.css.
Change styling to use font-size based margins, remove all
absoluted positioning.
Very old versions of PHP do not have JSON routines
built-in.  In that case, use an external library.
Decrease paragraph separation in message box.
Scroll to bottom in message box when new message
is added.
Start up new problem when in AUTHOR mode.
turning yellow on PM correct response, disabling textbox using eventFlag
Working on Node Editor startup in AUTHOR mode.
added sliders for accumulator nodes
Add specification for "genus" in the extra nodes.
Made calls in the pedagogical module consistent with
the genus names.
code added for displaying graph for student nodes
Merge branch 'master' of https://github.com/rptiwari/LaitsV3
Work in progress on author mode.
Minor fixes to charts
minor fixes - given model graph visible now even when student does not add any nodes
Major change to model JSON:  merge extraDescriptions into
givenModelNodes.  Class "model" now has subclasses:
   "model.given" all given model nodes, including extras.
   "model.solution" is all nodes in the given solution.
   "model.student" student nodes.
Updated documentation and various accessor functions to
match new notation.
fixed graph closing error
Merge branch 'master' into author
Merge branch 'master' into author
Restructure Node Editor controller to extend class
for student-specific and author-specific behavior.
Merge branch 'master' of github.com:rptiwari/LaitsV3