Added optional sort order parameter to results ref in DDGC::_build_xslate

Passing 'asc' as a third parameter will sort in ascending mode.
Sort comments by updated time in ascending order.
Fix for issue #93 - Cannot add github account if it contains a dash
Allow . in @mentions
commented the users_id column because we don't yet want to do a schema update
Merge pull request #99 from jbarrett/results-ordering

Results ordering
.travis.yml: generated changes don't seem to change much
ddgc_release: remove quiet mode--bring on the erorrs
ddgc_release: forgot other -q
lib/DDGC/Web.pm: update errorcatcher email target
Move email addresses to config
Tighten the at-mention regex and test it more thoroughly
Documentation for the main DDGC module
Disable GitHub integration
s/echo/printf/ in release script
Re-enable GitHub integration for development.

This reverts commit c2ed78bc3e39e0ef3f23eba1e26eabc37b53f7d3.
Upload DDGC to DuckPAN
Merge pull request #101 from jbarrett/issue93-github-validation

Fix for issue #93 - Cannot add github account if it contains a dash