separate Yoneda and Coyoneda
add Coyoneda instances
CoyonedaTest
Added whenM, untilM, and forever monadic combinators
Detailed example of Writer usage.
removed comments from Scala worksheet.
removed string interpolation
removed usage of foreach/ Each
Add Resources section to README

Hopefully this is helpful to newcomers.

In particular, it is very difficult to find the Scaladocs via web search. I don't know if I ever would have found them if it weren't for the topic in #scalaz on IRC.
Merge pull request #653 from kenbot/scalaz-seven

Added whenM, untilM, and forever monadic combinators
Merge pull request #656 (up until e6fc611)

Improved example of Writer usage.
Merge pull request #652 from xuwei-k/coyoneda-instances

Coyoneda instances
Merge pull request #664 from ceedubs/patch-1

Add Resources section to README