improved code formatting for some samples (using PEP8 guidelines)
PEP8'ified files in "samples/" directory
Removed unused modules from "samples/" files
Fixed the sample to make it run without having cocos2d package installed
Reformatted README.rst (lists, code/command blocks)
Reformatted README.rst (removed abundant quoting to make it easier to read @ github)
balldrive sample PEP8 reformatted & made it work without installing cocos2d package
PEP8'ified presentation sample (and removed unused modules)
Merge pull request #219 from hatarist/pep8

improved code formatting for some samples (using PEP8 guidelines)