Update to track with diagrams-core renaming, and a better Show instance for R2#47

Merged

fryguybob merged 3 commits intodiagrams:masterfrom byorgey:master

Sep 19, 2012

+21-2

Commits on Sep 16, 2012

names is now subMap
Brent Yorgey
committed
Add a more useful custom Show instance for R2
Brent Yorgey
committed

Commits on Sep 19, 2012

Custom Read instance for R2 to match custom Show instance
Brent Yorgey
committed