Merge pull request #300 from folone/scalaz-seven

Rope init/tail fix
get rid of Phaser to allow testing with Java 6
Merge pull request #301 from plokhotnyuk/scalaz-seven

get rid of Phaser to allow testing with Java 6
Travis CI: build against Java 6 and 7
Improved error handling in flatMap and filter.
Added tests for promise
Add safe print functions to effect
Update sbt-extras

[none]
IndexedContsT, etc.
Merge pull request #303