Merge pull request #3 from ptgreen/master

Enhance parser-lalr to the point of parsing/printing sexps for basic fns
Update rlex and rparse for recent language and library changes
Update rlex and rparse for language and library changes.
Implement support for structs and enums in parser-lalr
Fix generics_params and add item_use to parser-lalr
Update the readme to reflect the current state of the project.
Expand LALR grammar to include lambdas, paths in struct exprs. Refactor stmts.