Add github-style backgrounds to code blocks
A previous commit (9698018e) broke redirect functionality; this fixes it.
Lighter Heading Border

This makes the heading line the same color as wikimedia's.
Fixed links on activity page:

 * Links for pages were broken (by 0548c1a7) because the ".page" wasn't being stripped from the URL
 * Links for binary files now link to the appropriate revision (and handleAny now checks the revision parameter)
global replace spaces, make regex case insensitive
allow for patterns containing punctuation, metacharacters
Added Textile help.  Closes #434.
Revert "allow for patterns containing punctuation, metacharacters"

This reverts commit 10dc85643ca6348fd3fee615d6a2f227fe607012.

I think I prefer the less misleading word boundary behavior.
Added DocBook and Org markup help.
Updated CHANGES.
corrected mathjax CDN URL