The great image scaling rewrite of 2014 (MW)

Implement new logic in ve.Scalable from I5b4f0f91b.

Also update VE core submodule to master (57ed8d3).

New changes:
59a0afe The great image scaling rewrite of 2014

Change-Id: I24a2976036310d3814cc7d1853a68745e0499bd5
Merge "The great image scaling rewrite of 2014 (MW)"