Version bump
document the return type of a method
Fixes galaxy export bugs

Importantly:
  * Make sure we can accept Galaxy urls with or without the tool_runner
    part
  * Adjust the use of getExportParams to take into account the fact
    that it returns a promise.
Handle dynamic objects with grace and aplomb.
Moved some config into the demo from the code
Added an option for demo mine
Don't publish testmodel options
Rewrite of cell previews, for sanity's sake

Now with proper mvc concerns. The preview data is the model, and it is
displayed by the preview viewer, rather than being an abhorrent example
of spaghetti callbacks. Much saner.
Build for 1.7.2