Creates Link service, rudimentary initial UI
Note Law of Demeter violation
New links can be committed
Add links to remove origin/termination items
Ignore dev tools and log files
Implements base UI for creating connections/links

Slight LinkService behaviour change: staged origin/terminations will not
be cleared automatically upon successful commit, they must be cleared
manually
Fix missing transition declaration on orb
Consistent transition declarations

Remove redundant declaration on orb:hover
Fix link ui occluding last card
Removes 'Staging' button, adds its functionality to 'Add Link'
Merges branch 'link-ui'