Made dedicated examples directory.
Clarified example.py and added some comments in the code.
Added a note about CPython compatibility
testBase.py -> testBase.py
Example showing identify_observed=True
example.py->basic-usage.py
Explained changes in v0.5
Fixed names exported by observed package
bumped version number :D
Clarification of 'notable features' in README
Added TODO file to keep track of where we're going with this.