Make the DOM hash ignore text node splitting

Chromium splits text nodes on cursoring. This should not be signalled as a
content change to the DM; therefore the DOM hash should not change.

ve.ce.js
* getDomHash: use a single '#' for any number of adjacent text nodes

Change-Id: Ia04f7195ef62ff35a1bc1da6f0c7b40bbcc3ae2c