RemoteViewsTarget feature requested on #242

Ability to load a bitmap into an ImageView of a Widget using
RemoteViews.

Example of usage on the following gist
https://gist.github.com/pavlospt/00242d5102ac8f76e169
As a style nit: Make update parameterless, you always pass in the instance variable anyway so you can just refer to the instance variable directly in the method.