Change yaml.load usage to yaml.safe_load

It was brought to our attention yaml.load is unsafe.
Add documentation system
Correct gitignore to not ignore design and index files
Merge pull request #64 from johnlockwood-wf/config

Change yaml.load usage to yaml.safe_load
Merge gitignore from doc to main
Merge branch 'master' of git://github.com/WebFilings/furious into furious-doc
Add main table of contents document reST file
Replaced GAE_ROOT env with appengine.pth requirement
Merge branch 'furious-doc'

Conflicts:
	.gitignore
Remove doc/.gitignore
Merge pull request #65 from johnlockwood-wf/furious-doc

Furious doc setup
Move and rename xsrf test
Merge pull request #62 from johnlockwood-wf/add_xsrf

Add xsrf.py from head of webapp2_extras
Merge branch 'master' of git://github.com/WebFilings/furious
Merge branch 'master' into marker-tree

Conflicts:
	.gitignore
	furious/tests/extras/test_xsrf.py