Casting already defined instance vars
Set default radius for hover target.

Close #1375.
dragbox vars private
Privitizing relevant instance vars
removing arbitrary paren
ordScale -> ordinalScale
Merge pull request #1395 from palantir/privatePZI

Privitizing relevant instance vars
Merge pull request #1392 from palantir/privitizeDragBox

dragbox vars private
Removing Interaction Dead Code
Merge pull request #1394 from palantir/castInstanceVars

Instance variables are casted rather than redefined
Merge pull request #1403 from palantir/interactionDeadCodeRemoval

Removing Interaction Dead Code
Merge pull request #1390 from palantir/default_radius

Set default radius for hover target.
Merge branch 'develop' into auto_scale_stack