Fix for issue #445

Reversed the animation direction for water and lava. They should now
flow down as expected.
Fixes #492 - Camera bob on death
Fixes #490 - clean up normal/debug keys
Merge #493 from @NanjoW - normal/debug keys
Rearrange key bindings doc a slight bit more and add a couple contributors to the credits
Merge #491 by @mbrotz - Advanced monitoring
Fix three module classes with imports referencing moved files
Fixed tiny bug with huge performance impact on world rendering.
Merge pull request #499 from mbrotz/bugfixes

Fixed tiny bug with huge performance impact on world rendering.
Merge branch 'develop' into stackable-chunks-2