Parser support for let/var at the module level
Making progress in IR representation
Fixes for IntelliJ IDEA
Module state bytecode generation
Mention that we will adopt SemVer
Module state is now accessible to augmentations

We use an indirection to access module state through private static
methods rather than direct field access. The Golo runtime handles the
magic.
Tests for module-level state
Documentation for module-level state
Fix for closures as module-level state
Merge pull request #152 from jponge/wip/module-state

Module-level state