Fix node name clashes for filtered units
Fix up assembly scanning test

Just assemble, don't link.

Fixes GH-163
Make it possible to build CHECKED binary.

Use make clean - make CHECKED=yes. Ghetto, but better than nothing.
Remove unused variable.
Nuke some trivial warnings so we compile clean.

Clean with -Wextra -Werror on clang and gcc.
Accept absolute paths to build.
Adding embryo of VS2012 interop extension.

Currently support "compile current file with tundra".
Fix up path comparisons.
Compile on Linux.
Merge branch '2.0-beta' of https://github.com/deplinenoise/tundra into 2.0-beta