Empty strings should be allowed within MiniJava.
Fixes #63
Fixed termination expression semantics in FOR (and their associated
tests).
Fixes #62
Fixed typo in Block::getDeclaredVariable(String)'s javadoc.
Fixed ClassType conformance check vs. primitive types (first test
primitive types, then nullType, then same-class, then inheritance
hierarchy).
Fixes #50
Block instance variable access within a static context.
Fixes #61.
Merge pull request #64 from lunaskyrise/pixie-dust-tree

Fixes for the Final Stage