Add first draft of revamped contribution guide.
Minor wording fixes to contribution guide.
Mention further Git resources.
Mention setting up Git to ignore gedit backups.
Remove todos completed with this pull request.
Apply CC BY-NC-SA 4.0 and Apache 2.0 licenses.
Use 'student and faculty contrib' on front page.
Add missing gedit-EditorConfig script.
Fix URL to my SSH configuration.
Start section on system information.
Re-vamp section on system information.

Closes #1.
Move SysInfo up in table of contents.
Fix minor spelling errors.
Fix pip install requirements command.
Source the ~/.bash_profile in the launchd script.
Remove unused line.
Stop Waf warnings about before/after constraints.
Hack around EPUB build failures.
Merge branch 'master' into sean/revamp-contribution-guide
Remove build warning note in contribution guide.