Added a little notebook to explain some ways to use the bokeh extension.
import bokeh.server first for monkey patching
fix KeyError issue on interrupt and make exit a little nicer from bokeh-server
Merge pull request #396 from damianavila/bokeh_notebook

Added a little notebook to explain some ways to use the bokeh extension.
Added script to generate changelog.
Merge pull request #397 from lexicalunit/master

Added script to generate changelog.
Merge pull request #398 from lexicalunit/master

Added script to generate changelog.
editing
Merge branch 'master' of github.com:ContinuumIO/bokeh
ignore ipy checkpoints
fix #399
getting ready for 0.4.2 release
remove toggle behaviour from hold(), behaves badly in the notebook when cells are re-evaled
General enhancements to changes.py script.

Fixed typo: bugfixs -> bugfixes.
Changed header label to "Since X" to avoid confusion.
Added option to set the new version name.