Fix CRLF
Added redis.sheet
Expand Mercurial sheet.

I wrote nearly all of the Mercurial 'cheat' page. Copying the content
to ch because steps for rewriting history are what I most frequently
forget.

Conflicts:
	mercurial.sheet
Link to the correct CH project home.
added tmux sheet
Added cucumber sheet
Rename the cucumber sheet
Added Capybara sheet