Fix bitmap recycling bug
remove unused readme
Replace PathLoader with ModelStreamLoader

A major change that should allow a larger range
of images to be used (i.e. those to which it is
only possible to obtain an InputStream and not
a path) as well as making it possible to download
and store images directly in the cache without
an additional class or disk cache.
Get the flickr example working again
Use direct loader in list, downloader in grid

The two grids will download each image once and
then resize it twice, the list will download and
resize each image separately to demo two different
ways of implement model stream loaders
com.bumptech.photos -> com.bumptech.glide
Update and fix some typos in read me