Update readme and set integration versions to 1.0

Conflicts:
	integration/okhttp/build.gradle
	integration/volley/build.gradle
Update license.
Add warnings for future api changes.
Pull out EngineResource wrapper class.

Conflicts:
	library/src/main/java/com/bumptech/glide/load/engine/EngineJob.java
	library/src/main/java/com/bumptech/glide/load/resource/bytes/BytesResource.java
	library/src/main/java/com/bumptech/glide/request/GenericRequest.java
Conflicts:
	library/src/androidTest/java/com/bumptech/glide/load/engine/EngineTest.java
	library/src/main/java/com/bumptech/glide/load/engine/Engine.java
	library/src/main/java/com/bumptech/glide/load/engine/EngineJobListener.java
	library/src/main/java/com/bumptech/glide/load/engine/Resource.java
	library/src/main/java/com/bumptech/glide/load/engine/cache/LruResourceCache.java
	library/src/main/java/com/bumptech/glide/load/engine/cache/MemoryCache.java
	library/src/main/java/com/bumptech/glide/load/engine/cache/MemoryCacheAdapter.java
Performance improvements in flickr sample.
Set version to 3.3.0 from 3.3.0a