hkl/hkl — pull request #21 by cknadler (2012-09-15 09:52:10+00:00)
Title: Adds statement and expression classes

Adds several container classes for expressions and statements.
This is by no means a complete implementation of expressions and
statments. Assert, assign, include, puts and return should all function.
Expression is done without any of the type checking (which is crucial).

There is also a small problem with the makefile on OSX making all of
this code impossible for me to test. I elaborate on the problem in #20.
Until that is solved, dont merge this code just to be safe.