Initial stab at documentation skeleton.

Includes initial work on revision and activity log resources.
Simple typo fixes.
Merge branch 'master' into sphinx-documentation
License, license headers, documentation of headers and process.

gGRC will be licensed under the Apache 2.0 license. Developer
documentation is provided to specify this as well as to specify the
license header that will be added to all source files.
First stab at defining an external review process for gGRC.

These reviews will cover security, privacy, and other concerns.
Merge pull request #1 from reciprocity/sphinx-documentation

Dry run of document/code review using pull requests