test /files/ gives 403 on hidden files
Merge pull request #4371 from astrosilverio/master

Restored ipython profile locate dir and fixed typo. (Fixes #3708).
update test requirements for IPython.html
Windows testing fixes
stat has no st_flags on Windows (maybe elsewhere?)
send ignored output to devnull

rather than PIPE, since Windows pipes can fill up.
py3k bytes, for crying out loud
s/os.path.sep/os.sep/
tweak stat walk in forbid_hidden
Merge pull request #4303 from ipython/multidir

Add multidirectory support for the Notebook.

Major change to URL schemes in the notebook server,
documented in [IPEP 16](https://github.com/ipython/ipython/wiki/IPEP-16%3A-Notebook-multi-directory-dashboard-and-URL-mapping).
put back missing new_figure_manager
Merge pull request #4419 from minrk/inline-no-mpl

define InlineBackend configurable in its own file
Improvements to kernel.js

- dispatch iopub handlers by msg_type
- add Kernel.send_shell_message public API
- use strict (and related fixes)
add Kernel-side widgets
add javascript-side widgets
document widget messages
fix js/Python WidgetManager symmetry

remove some log statements
make js / Python widgets symmetrical

don't enforce creation on Kernel side

also removed weak refs - premature optimization,
we can think about this later.
update widget message spec doc to reflect symmetry
fix Widget.primary