Cleanup and a few optimizations
Cleanup and a few optimizations

Methods and attributes that were referenced multiple times were replaced by a local variable.
Removed unnecessary initializations
Cleanup (removed unneeded brackets and docstrings follow PEP8)
Made extrapolate methods much faster by using Python's ability to access a range of a list.
Replaced fastFloor with real floor which is actually much faster.
lmas/opensimplex