Add an Audio display class

This is a first attempt at addressing issue 4241.
Fix unnecerary dependence to numpy
Move imports into methods and fix docstring typo
Fix talk about image embeding in the Audio class.

Too much copy paste I guess :)
Change to encodestring to b64encode to avoid newlines in the data URI

The point of this is to improve compatibility with older browsers.
also, encodestring is depricated in python 3.
Fix extra ) syntax error
Fix broken normalizing when signal array already has integer type

A case of unwanted integer division.
Speed up normalization if numpy is avaliable
Make it explicit that we don't support encoding stereo PCM signals
Remove support for encoding audio without numpy for performance
remove attic documents from source code
remove unused files
README now includes description of make targets
update help to include html_noapi target
remove do_sphinx file
removing ipython.el, not updated since 0.11
Restored ipython profile locate dir and fixed typo. (Fixes #3708).
Changed ipython profile locate foo -> ipython locate profile foo in docs
split adds new cell above, rather than below

preserves the order of code and output across split event

rather than moving output into the middle of the split.
split focuses the top of the newly created cell