Fix missing type issue and add comments.
Update .gitignore

DRRacket files
Update gitignore
Update gitignore
deleting more files
even more things deleted
Merge branch 'dynamics' of github.com:landakram/hopper
Merge branch 'dynamics' of github.com:landakram/hopper
Remove DS_Store
fixed test
allowed math symbols in comments
Very rough start to fixing object method calls
made test workable
Edited getType to return type referred to by identifier
Cleaning up
Changed expression-type for a general solution
Allowed bindings to vars inside objects
Update AST to give Dynamic number methods
Dynamic types accept any method or variable
Clean up AST file (remove methods from dynamic since all work)