pycadf documentation

add basic documentation on CADF spec.

Closes-Bug: #1279951
Change-Id: Ie1703d9b5109d8275377857e5362e3b09385f647
Implements: blueprint document-pycadf
add OpenStack Foundation as author

add OpenStack Foundation as author

Change-Id: Iac1b743fa4c0d0ead2badaee5f36451e91465bf0
Updated from global requirements

Change-Id: I7724427b68627853bbff368834a24a993ef723bf
import run_cross_tests.sh from incubator

Change-Id: I1605e828c4078d723862fa2b7e16a4916964a5ac
reorder documentation

- reorder documentation so it's grouped logically.
- add api docstring modules

Change-Id: I47e49634fe7d8bb16a51f3045e7fe53683d56d1a
Updated from global requirements

Change-Id: Ib667b02069ba68b4e33eae844caae6d33ba368c3