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
see https://github.com/bumptech/glide#build how to build, you may also need to remove `ROBOLECTRIC_VERSION`'s `-SNAPSHOT` in gradle.properties **locally**, since 2.4 is released.