Move docgist to http://gist.asciidoctor.org/
Merge pull request #1 from nawroth/patch-1

Move docgist to http://gist.asciidoctor.org/
Update README.adoc with new URL, better structure
Update README.adoc with better description & history
Update description & example; default to example.adoc in main repo
Upgrade to Asciidoctor 1.5.0.rc.2, including adding web fonts. Enable admonition icons. Fixes #5
Make the headings links.
Support riseup pads. Code cleanup. Fixes #6.
Upgrade Asciidoctor to 1.5.0.rc.4. Fixes #5.
Upgrade to Asciidoctor 1.5.0.rc.5. Updated the front page.
Clean up parsing of source URLs, add more Etherpads. Fixes #2.

* Restructures the source URL parsing code to make it easier to add new hosts.
* Support for many Etherpad sites.
* Support for raw.githubusercontent.com.