Trying to implement locals/multi-exprs

This is broken, b/c we need to cast our JSON objects
so that their types can be reasoned about
Consolidate parsing tests since they are expensive integration tests
Parser sets and gets local variables
Consolidate local vars
Parses send
Refactor array casting/parsing into helper function
Consolidate sending messages
Parses constants and class definitions
Consolidate class/module definitions
Parses method definitions
Consolidation and cleanup in TestParser
Parses self, set/get instance variable, and acceptance test
Cleanup a bit

Remove acceptance test
Consolidate self/ivars
Realign case statement
Extract parsing code from test into RubyAst and ParseRuby
Merge branch 'broken'
Interpreter works against RubyAst rather than Dynamic anonymous structures
Rename methods in ParseRuby, set path in Rakefile instead of using relative location to ast_for