Merge pull request #13 from sachinsudheendra/master

Linking roadmap entries with github issues
[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.