Merge pull request #478 from KevWright/master

Updated basic guide policy writing
Merge pull request #479 from KevWright/master

Added more content instructing how to write promises
Merge pull request #480 from KevWright/master

Some fixes to how to write promises
Merge pull request #481 from KevWright/master

Updated policy writing guide with GitHub + Git info
Moved role based guides to overview section
Merge pull request #17 from TekHus/moving-content

Moving role based content from guides to overviews