Uncollapse comments section if URL links to a comment

Fix #6

This fix assumes that disqus comments href are of the format
`#comment-<digits>`

This commit also adds the ability to uncollapse comments section if hash
is '#disqus_thread'.

User can add other collapse groups too. This fix will uncollapse them
too if proper hash is used.
Fix indentation
Update RELEASE_NOTES and THANKS