fix tempo calculation bug
fix constructor error for ControlEventChange
Rename README to README.mediawiki so that github will properly render it.
Fix typo
Add <pre></pre> tags
Fix a bulleted list
Warn about out of date examples (issue #3)

https://github.com/vishnubob/python-midi/issues/3
Document github URLs
Demote all section headers except the first one.
Add Installation section to README
Merge pull request #6 from 'ebattenberg/master'

https://github.com/vishnubob/python-midi/pull/6
Merge pull request #8 from aspiers/master

polish README