Remove method -handleEvent: from TBSMNode protocol.

Remove all implementations as well.
Update unit tests.
Update CHANGELOG.md.
Update Podfile to conform to version 0.34.
Cleanup.
Update concurrency tests.
Update to latest slather version.
Add workaround for Xcode 6 issues.
Update README.md.
Raise version number to 3.0.1.
Merge branch 'develop'