Merge branch 'release/0.1.9' into develop
Setting version to 0.1.10-SNAPSHOT
adds gpg plugin for publishing
Merge pull request #126 from twitter/feature/add-gpg-publish

adds gpg plugin for publishing
Adds AdjoinedUnit Ring
Adds isNonZero to AdjoinedRing
Merge pull request #130 from twitter/feature/adjoin-ring

Adds AdjoinedUnit Ring
Cleans up intTimes
Merge pull request #131 from twitter/feature/intTimes-cleaner

Cleans up intTimes
Adds some operations to MapAlgebra
adds join
Removes a confusing comment
Adds a comment (to restart travis)
Fix a broken test, add Monoid.zeroEquiv
Merge pull request #132 from twitter/feature/map-algebra-graph

Adds some operations to MapAlgebra
Adds a ResetMonoid which handles situations requiring resets
Minor allocation improvement
Merge pull request #133 from twitter/feature/reset

Adds a ResetMonoid which handles situations requiring resets
 Adding foldM to Monad and a test
Make sure we compile to jdk 6