ini alreadyresister class
change sitemap and add alreadyregister class
Remove unneeded file
Improve comments in header
add hyperlink for keyword to search by subject
add link to each keyword term

Modified yonghaoy's commit to add a separate link to each keyword term,
per the feature request, instead of a single link spanning all terms.
updated xsl for changeset
make url for keyword link on data package page relative

updated stylesheet DryadItemSummary.xsl to make the keyword
term link relative to the current host, instead of the prod
server
Merge remote-tracking branch 'upstream/dryad-master' into dryad-master
Merge pull request #681 from ryscher/dryad-master

Update of Register email 190. I'm merging my own pull request here, because it's Yonghao's code that I reviewed. All I did was add some comments.