(#1515) - Add authentication headers on destroy

"Remove a pouch" tests were previously failing against
Cloudant databases. The root cause appears to be due
to authentication headers not being added to the DELETE
request correctly.

This patch adds the default headers (including authentication)
to the request and the test now passes.
(#1760) - Remove social buttons for now
(#1770) - Return status 'cancelled' when replication is cancelled
(#1773) - Intermittent allDocs error
(#113) - Run coverage tests and upload results
(#1771) - Defer changes error
(#1775) - add getUrl() to http adapter
(#1769) - New logo w/ site updates
(#1758) - Blog post for the release
(#1783) - Added viewport meta tag
(#1785) - Small fix for IE versions where `addEventListener()` is not defined.

Use `attachEvent()` instead.
(#1739) - lower continuous changes feed timeout

to prevent from being aborted via ajax timeout
(#1769) - consistent capitalization/hash
(#1790) - Added favicon
(#1758) - Welcome to the blog blog post
(#1758) - Add CNAME to gh-pages
(#1793) - copyedits for 2.1.0 release post
(#1761) - Remove extraneous excerpt
(#1758) - Fix release notes url
(#1782) - Fixed sticky sidebar