Merge pull request #30 from mdaliejaz/master

Adding details about Geeknight Chennai
added npm poller & xunit converter to the list
make plugin listing a table
add tables extension

http://stackoverflow.com/questions/16099153/table-not-render-when-use-redcarpet-in-jekyll-github-pages
extension not working. will figure out later.
need HTML tables for it to work on go.cd
update plugin listing
[Plugins] Styling community plugins page
Fixing download button on homepage
Change in analytics code
#31 - Image-based to font-based icons for header

Still kept image as IRC channel icon (still not available as font
character).
Adding a copy of my blog post on using #gocd with custom certificates
Merge pull request #32 from sachinsudheendra/master

Adding a copy of my blog post on using #gocd with custom certificates