Fix lub of raw and generic type.
Fix subtyping for NullType.
Make sure UnreachableType doesn't leak out of method return values.
Fix macro classpath.
Support compiling a directory,
Fix block arguments in macros.
Add cast helper method for macros to use.
Patch bad bytecode in mirah.lang.ast.Unquote
Support Noops inside ClassDefinition
Methods shouldn't return NullType
Fix vmofule -- loggers get garbage collected if no one retains them.
Test for nil methods.
Improve debug output for type futures.
Add intrinsics to NullType
Implement unary minus operator.
Fix inference for rescue body.
Fix classloader used for loading macros.
Fix 'raise ex' where 'ex' is an exception object.