--updated interface category descriptions
--updated all enum TODOs defining all elements
--update all use case TODOs defining some use cases
--moved comments to issues
--fixed typos/syntax errors
--removed comments that have been addressed
--made a pass at making units consistent in the way they are documented
--removed duplicate tire pressure
--made boolean documentation consistent
--remove year range for year
--made zone pass
--made a pass at interface headers
Merge pull request #36 from tripzero/master

Looks OK. It'd be better to merge first and fix later if there is an issue. Otherwise, it'll be hard to merge the other commit because of conflicts.
Resolved conflicts
Merge branch 'occops-master'

Resolved conflicts between Kevrons's last commit and Paul's.
Fixed dt/dt for zones
Removed space before ? according to http://www.w3.org/TR/WebIDL/#es-nullable-type
added security section