Use per-node recognizer lists

[dfreedm]

This will reduce the number of extra events generated.

Plan:

• Put a list of gestures on node
• Mark events with what gestures they will generate
• If an event is handled at node and did not generate one of node's gestures, generate gesture and mark event

[dfreedm]

Fixed with https://github.com/Polymer/polymer-gestures/commit/9f8e51b8dfe77c636a2b9bd4c1ea1a8783dff4a5