add crypto
Remove extra whitespace
Add crpto below xml in scenarios
Rework setuptools and pip docs

Clarify a little more what setuptools allows you to do, what pip is, and
what advantages it has.
Merge pull request #465 from amiralis/master

add crypto
Change license chooser from Open Art to Github

The Open Art license chooser is geared towards art/media related licenses.  The Github license chooser site is a better fit here.
Merge pull request #467 from alex-sf/master

Change license chooser from Open Art to Github
Incorporate changes suggested by @sigmavirus24
Merge pull request #466 from mandarg/master

Modify setuptools and pip docs for OSX
Added Github Atom to env.rst
Merge pull request #473 from syndbg/master

Added Github Atom to env.rst
Update imaging.rst
Merge pull request #475 from evanv/master

Update imaging.rst
Added more info in virtualenvs.rst.
Added commands to specify python interpreter version.
Added build/ directory to .gitignore
Update learning.rst

Python Cookbook has been added to the list.
Merge pull request #477 from ugurcaliskan/patch-1

Update learning.rst
Merge pull request #476 from BastiTee/master

Added build/ directory to .gitignore
Merge pull request #474 from syndbg/master

Added more info in virtualenvs.rst.