Merge tag '0.0.1' into develop

Tagging 0.0.1 release
Add support for 'or' keyword
Add test for complex or expression
Fix bug in evicting cached compiled expressions

Added a unittest for this as well.  This also included
added a default equality comparison to the AST nodes.
Add compliance test for 'or' expressions
Bump version to 0.0.2
Merge branch 'release-0.0.2'