Dev Portal from Staging to Master for 10/27 FINAL PUSH

This release is the final release of the old Dev Portal prior to freezing it and porting the content to the new site. This release contains the following improvements:

*   A draft of the Gateway Services spec to for commentary and feedback from partners and community
*   Redone README.md file that isn't so REST-centric
*   Some revisions to the CSS to make the pages easier to read
*   Minor markup improvements for several pages