Added formatting for methods without documentation

This is a first pass on issue #182— it grays out methods, variables, and functions on the left sidebar of the class page that do not have any documentation.

I didn't implement it on the main page—if people are interested, that's not a hard addition.   Also, I'm not sure what the inline doc code that was added today by arturo does—this pull request doesn't touch that code that at all.

Thoughts?