Merge pull request #4322 from damianavila/scrollup

Scroll to the top after change of slides in the IPython slides
Some changes to improve readibility.
Added closing slash to meta.
Added title to full_html and slides.
Make irunner compatible with upcoming pexpect 3.0 interface
Use cast_bytes_py2 for getpass() prompt
Remove pycolor script
Adjust tab completion widget if too close to bottom of page.
Removing inversion of the completion list.
Fixing minor comment.
Merge pull request #4347 from takluyver/drop-pycolor

Remove pycolor script

We install a script to syntax highlight Python code in the terminal. This is quite obsolete, though, since the pygmentize command from Pygments offers the same functionality in a much more flexible way (more languages, more styles, other output formats).

This removes the wrapper script, but all the functionality is still there if you use python -m IPython.utils.PyColorize.
Open pdf after compiling (configurable)
Merge What's New entries from pull requests
Add script to update whatsnew file from PR snippets
Adress comments

 * move file extension addition outside of function
 * move log statement before function call
 * change default to False
 * add postprocessor to nbconvertapp
test WinHPC launchers on all platforms

the tests don't actually launch anything, they just write template files,
so they can run on any platform.
elementtree.tostring is always bytes
passthrough kwargs in WinHPCTask `__init__` methods
Don't reset the readline completer after each prompt

This makes it impossible to setup a custom completer. The comment says that
"we must ensure that our completer is back in place," but I don't see why. All
that does it make it impossible to use a different completer. One can trick
IPython into not doing this by monkeypatching ip.has_readline to False, but
then certain features like multiline editing are no longer enabled.

See https://github.com/davidhalter/jedi/pull/321.
Merge pull request #4281 from ellisonbg/complete_above

Adjust tab completion widget if too close to bottom of page.