Introduce a PXURLBitmapLoader that allows a pluggable way to attach Bitmap downloaders that can do advanced operations (like caching, authentication, etc.)
More changes to the Bitmap loading.
Make the callback interface generic. Went back to loading any remote resource with the PXImage is initialized.
Set the version to 0.3.1
Merge pull request #8 from Pixate/shalom-url

PXURLBitmapLoader to handle image loading