Initial support for source comments
Add a few more kinds of cursor
Start testing comments
Convenience Comment#children
Make Comment#text format the paragraph

Grab all the lines in the paragraph and put them together
Reindent comment.rb
A bit of param and block support
Use different classes for comment types
Bind more methods to param and block command comments

Including a helper #comment to get the text for e.g. the description
of the param or return value.
Merge pull request #4 from carlosmn/comment

Support source-code comments.