ctrl-n and shift-ctrl-n in control panel open new notebooks
start on Ctrl + Shift + a at notebook level
merge from master
remove debug logging
add documentation
remove experimental code
Merge pull request #646 from twosigma/spot/tuts2

Improve the tutorials
fix autotranslation of python by adding python-yaml, and getting more recent version of pandas, while avoiding too new version of matplotlib
same as previous change to dockerfile
fix autotranslation of R on ubuntu by apt-get installing libcurl4...dev
Merge pull request #647 from twosigma/spot/key-commands

add new-notebook key command to start page
Fix Issue #650 by chaning JS to Js in its logo
merge from master