Modify the standard form of ASTs; Add functions for constructing ASTs
Move LaTex parser and renderer to Model class; Make Model a class of Ast
Fix Model parser, renderer; more refactoring
Merge branch 'master' of https://github.com/artcompiler/L15
Finish refactoring Model; Make math model a plugin stub
Fix handling of variables; add model tests
Removed unneeded library files
Fix bug with calling plugin functions
Merge branch 'master' of git://github.com/artcompiler/L15
Clean up AST interning of primitives; add lots of tests for Model
Tweak node interning
Add op string constants to Model
Fix negation
Fix handling of unary minus
Move src/math-model.js to test/simple.js
Make Ast.intern a static
Make dump() and dumpAll() statics
Handle dfrac
Allows {} in primaryExpr()
Add assert