update to 1.2.0 (closes ITP #705844)

Bump to Zuul v1.2.0.

[debian/control]
 - dependencies: extras is needed. Pin voluptuous <0.7.
   statsd is optional: Zuul does not requires it, makes it a suggestion.
 - Vcs-Git and Vcs-Browser
 - adds myself to Uploaders

[debian/rules]
 - honor DEB_BUILD_OPTIONS=nocheck

[debian/watch]
 - updated regex we want to be as precise as possible so escape dots and
   use \d when looking for numbers.

Lintian fixes:

* extended-description-is-empty
  Copy pasted the description at http://ci.openstack.org/zuul
* new-package-should-close-itp-bug
  Filled ITP #705844

Tested using:

DEB_BUILD_OPTIONS=nocheck git buildpackage --git-verbose