Added separate muni part.

Included contents of 2012 rulebook and applied some proposals. Fixes #6, fixes #3. Included proposal text for track ratings (#4).
Changed course lenght requirements. Fixes #2.
split Muni courses and starting modes in separate sections. fixes #1
Added test run requirement to muni courses section. fixes #5
Age groups formatted with tabular.
added labels. fixes #7
Merge branch 'master' of github.com:schocco/rulebook
Proper list formatting (introduced dependency to enumerate package).
Merge pull request #1 from schocco/master

Include muni part, thanks to rocco.