changed regexes in doc.js to match replace from : to _

@stephenliberty

In major rewrite part 1 you ran a replace from ":" to "_" (I'm assuming to fix a windows file system issue?)
In any case, there are regexes in docs.js that rely on the column to match and match the wrong string.
This breaks the grouping functionality in the API sections (see the Angular docs directives in a generated site). 

I fixed the regexes to check for underscores as well as columns.