javascript is no place to start adding title tags
added descriptions which were deleted from JS
add more tooltips for Cell menu
Kernel and Help menu tooltips
tooltips for View and Insert menus
added some tooltips for the File menu
remove monkey patch for older versions of tornado

Since we now depend on Tornado >= 3.1, this code path is no longer
necessary
Merge pull request #4450 from ivanov/remove-old-tornado-monkeypatch

remove monkey patch for older versions of tornado
Merge pull request #4415 from ivanov/more-tooltips

More tooltips in the Notebook menu
Reimplemented penalize_magics_key
Reimplemented test_magic_completion_order in test_completer.py
Merge Pull Request #3801

Autocompletion: ordering of completions for magic commands and variables with same name

closes #3723
closes #3801
Merge pull request #4198 from jdfreder/versionconversion_nbconvert

add upgrade / downgrade to nbformat
Use explicit relative imports

python-modernize with lib2to3.fixes.fix_import fixer
Convert print statements to print function calls

libmodernize.fixes.fix_print
Make raise statements Python 3 compatible.

libmodernize.fixes.fix_raise
Fix exec statements for Py 3

lib2to3.fixes.fix_exec
Fix imports of builtins module
Fix long integer literals.

2to3 fixer: numliterals (+ manual changes)
Replace references to unicode and basestring