Add `tox` and `coverage` for testing.

`tox` create clean environment for testing and it can specify Python and
django version.
Add installing/testing/running documentations
Fix README issue
Add MANIFEST file
Update README
Add .coveralls.yml for command line usage
Specify python version to run correctly coveralls
Merge pull request #24 from kawazrepos/add_new_testing_storategy

Add new testing storategy
Add base template
Add views for Event
Implement class_view_decorator
Add test cases for Event model
Add EventManager test cases
Implement Event views
Implement get_absolute_url on Event model
Add specs for EventDetailView
Add specs for EventCreateView
Implement EventForm
Add new test utility and fix event model tests
Add specs for EventUpdateView