Improved isInstanceOf checks in tests for contain matchers.
Added missing tests that ensure OneInstancePerTest and ParallelTestExecution only executes nested suites in outer instance.
Fixed broken sbt build.
Adjusted sbt new framework implementation according to latest adjustment in test-interface.
Changed release version to 2.0.M6-SNAP14.
Fixed two tests broken by the change to the error message with null at the left.
Merge pull request #9 from cheeseng/test-interface-1.0-SNAP2

Test interface 1.0 snap2
Merge pull request #8 from cheeseng/sbt-build

Fixed broken sbt build.
Merge pull request #7 from cheeseng/ticket-112

Missing OneInstancePerTest/ParallelTestExecution tests.
Merge pull request #6 from cheeseng/ticket-98

Improved isInstanceOf checks in tests for contain matchers.