Add verify-requirements util
Use verifyRequirements in script/bootstrap
Update bootstrap requires
Add better python path description
Merge remote-tracking branch 'origin/master' into cj-add-python-check
:checkered_flag: Verify python version for build

References:
https://github.com/TooTallNate/node-gyp/blob/56dcb889091a6a0594854ccc517e498b21078d5f/lib/configure.js
Add example for unset! directive
first part of debugging guide
Move explanation for unset! example into the text
Mention how to get the full stack trace for errors
Issue reports should include Atom version and OS
Normalize resource path in AtomWindow constructor
Match backslashes in stack traces on Windows
Normalize resource path in remaining locations
Add missing l to global
Use path.join instead of path.resolve

Applies commit 41ab48b to spec-bootstrap.coffee
Merge branch 'jugglingnutcase-exec-python-for-version' into cj-add-python-check
Rename postVerification method to bootstrap
Mimic Atom’s if/else style convention
Reuse pythonExecutable variable