Update readme
0.4.0 update

- Rolled back changes made in 0.3.0 as they were poor and lost lots of
file change history.
- Updated framework versioning to 0.9.1 as the officially supported
version of LOVE (though nothing in the framework depends on LOVE 0.9.1)
- Removed module root from the path to make more clear namespacing
- Added L.metadata for holding information about modules. This will be
used a lot more in the future
- Added L:base_path for getting the path of a module minus the module
name itself.
- Fixed a couple error handling mishaps
- Updated all files to match the new namespacing
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