Removes extra pyglet.clock.tick().

There is already one running in pyglet.app.run().
This extra one was artifically ruining performance…
Removes globals.py from cython compilation.

Since we redefine the globals module during runtime, we don't want
to have C limitations.  With globals compiled py Cython,
controls weren't working.
Merge branch 'master' of https://github.com/boskee/Minecraft
Fixes blocks.py imports.
Removes FPS limitation.  Pyglet handles that automatically.

MAX_FPS is still used for the update rate.