fix 'close and halt' in notebook File menu
Specify unicode type properly in rmagic
Don't try to wait for StreamCapturer that was never started
Don't show subprocess output if there isn't any
Use stream capturer for kernel tests
ensure Application.argv is unicode

(safely with cast_unicode, never raise on bad values)
don't relay notebook dir to kernel from command-line
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
don't warn when open_browser and not file_to_run
define InlineBackend configurable in its own file

avoids unnecessary matplotlib imports
use get_ipython API function, not builtin injection, to detect IPython.
Allow checking for backports via milestone
Merge pull request #4414 from takluyver/rmagic-unicode-type

Specify unicode type properly in rmagic
Fixing progress bar bug introduced by scrolling.
Changing position property to static for a more robust fix.