Fix an order of operations error in CenterCrop.

Fixes #88
Upload a single jar rather than all subprojects.
Upload snapshot using travis.
Remove maven pom files.
Fix lint warnings in flickr sample.
Simplify volley integration code and build.
Simplify samples build and layout.
Simplify library build and remove unused files.
Add simple OkHttp integration library.
Create glide subproject to generate jar
Cleanup gif decoder build.
Update readme
Upload a jar for all integration projects.
Apply more universal exception handling.
Don't cancel new runners from old jobs.

Fixes #91