Merge pull request #266 from ripple/develop

[DOC] Move api, install documentation to dev.ripple.com
[DOC] Correct documentation, config.json not config.js.

[FOLD] Use config.json not config.js in mac install doc.
[TASK] Add release notes, bump minor version.
Merge pull request #275 from ripple/release-3.26.0-rc1

Release 3.26.0 rc1
Merge branch 'master' of github.com:ripple/gatewayd