Updated gitignore.
Updated html to use local jQuery.
Sticky tag scrolling now works, more or less.

(Still have to remove some excess code.)
Preliminary move to decouple tag viewer code.
Reorganized things a bit.
Various changes.
* added a few jQuery functions
* added connection addition and deletion
* changed demo tags to programmatic
* clicking on endpoints adds/removes
Slightly prettier connections.
Clicking on right tags now deletes connection.
Removed demo code.
Added global click handler for future.
Removed endpoints.
WIP for animating additions/deletions.