Merge pull request #55 from dsoprea/master

Added object attribute documentation.
event doc updates
pep8
Merge pull request #53 from mreiferson/pep8_53

pep8
bump 0.6.0-alpha
add license
Add channel sampling support
Merge pull request #57 from elubow/sampling

Add channel sampling support
Added new sync logic, and two test scripts.

Still need to implement greenlets and write unit-tests.