build.gradle - added tests config, cosmetic changes.
NetworkImage - fix nullPointerException.

1. getLayoutParams() can be null.
2. old version used LinearLayout.LayoutParams instead of ViewGroup.LayoutParams
Remote executable bit from ImageLoader

This shouldn't have been executable.

Change-Id: Ib5c23ed853a99a4db55f1f2605528f4d9717ad24
Added README.md
Custom modifications to the library :

- Allow target dimensions to be set in NetworkImageView
- Don't treat non 5xx responses as errors.
Allow Bitmap.Config to be specified in ImageLoader#get /
NetworkImageView#setImageUrl