Merge pull request #74 from juhasch/master

Update navigation-hotkeys extension
Add license terms file

This adds a stripped version of the IPython license file.
Update README

Clayrify IPython-contrib relationship to IPython
Execute timings initial commit

This extension displays below the input box when the last execution of
a cell occurred and how long it took.
updated the license and the description
Added toggle all/current menu

Also got rid of checkboxes in the cell toolbars
Merge pull request #76 from juhasch/copyright

Add license terms file
Update copyright notice

Remove IPython Development Team copyright notice
Merge pull request #78 from juhasch/copyright

Update copyright notice
Merge remote-tracking branch 'upstream/master'
Starting the timer on a more precise event

Patching cell.execute() to trigger a new event. Listening this event
instead of execution_request.Kernel
Merge pull request #77 from jcjaskula/executeTimings

Show when and how long a cell has been executed
Merge remote-tracking branch 'upstream/master'