Updating Bokeh to 0.6.1
Updating CHANGELOG and release notes to 0.6.1.
Fix for axis types string comparision (is vs ==)
Merge pull request #1253 from ContinuumIO/release_0.6.1

Release 0.6.1
Merge pull request #1271 from rageTrue/patch-1

Fix for axis types string comparision (is vs ==)