[Download page] Add checksum link
Inlining checksums along side the download links

The checksum file has an extension of .checksum, which is very inconvenient to open in a GUI editor. Also, since it is a java properties file, it is not very user friendly. Many sites provide the checksums along side the downloads and being the general pattern, I thought we could move to that. The 'Checksum' header links to the downloadable file.
Adding RSS plugin for Jekyll. Enabling RSS for go.cd blogs at /posts/rss.xml. Added RSS icon besides BLOG header on /blog.html.
Merge pull request #16 from sachinsudheendra/blog_rss

Adding RSS plugin for Jekyll
Merge commit '2fdf1d2' into inlining_md5
Removing Verify link from the bottom of the downloads page
Merge pull request #17 from sachinsudheendra/inlining_md5

Inlining checksums along side the download links
Revert "Adding RSS plugin for Jekyll. Enabling RSS for go.cd blogs at /posts/rss.xml. Added RSS icon besides BLOG header on /blog.html."

This reverts commit 8d2f860fde0fb9fae3c43d31f69c96205d358418.