add Figure B synonym for Diagram b v n
dia to diagram
Merge pull request #73 from diagrams/token

Add Diagram B synonym for Diagram b v n
travis: skip HP-2012, allow failure on GHC-7.4.2
travis: fix syntax of allowed failures
Add group opacity annotation.
Remove old Measure.
Add InSpace and SameSpace.
Add Measure back to core.
Call it opacityGroup.
Use HashMap for Style.
Remove redundunt generic attributes.
Merge branch 'new-stuff' of https://github.com/diagrams/diagrams-core into new-stuff