Use real data on new-dashboard datasets view (WIP)

Solves #1453 
@CartoDB/frontend 
This PR is still WIP, but I wanted early feedback on this particular part.

**Problem:** Currently there's a lot of repeated event handling that I think we should DRY (i.e. implement once and reuse everywhere). 

**Proposed solution**: Since we're using browserify for the newer stuff, we can create single modules that encapsulate specific behaviour, and only require them where actually needed. 

See the inline doc above, or the rest of the changeset, for where/how it is applied, and let me know what you think.