(Bug 43304) Changed DOM for snak type selector

Adjusted 'wb-snak' Template to have a node for the snak type selector.

- patch set 2: Added Function bodies and TODOs for implementing type selector into jQuery.SnakView

Change-Id: I5b4d11e916c9448d4893a5a74e65406edd25d696
(minor) adjust selenium tests for new snak type selectr DOM

Change-Id: I7943972baf4ce8b15d7d1e2ac128a8a016d8e947