Center fake node when link in 'Connections' clicked.
Move third-party JS libraries to thirdparty/.
Move skeleton/* to root directory.
Check subdomain also when grouping tree by URL.

Now "cse.tamu.edu/" and "engineering.tamu.edu/" will be children of
"tamu.edu/", which was not the case earlier because they all have the
same domain "tamu.edu" and path "/".
Add .gitignore.
Remove opendns.js.
Make OpenDNS category fetching modular.