No request replay if we don't scan network state changes.
Merge pull request #479 from square/dimitris/more-fixes

No request replay if we don't scan network state changes.
Merge branch 'master' into disk-cache

Conflicts:
	picasso/src/test/java/com/squareup/picasso/DispatcherTest.java
	picasso/src/test/java/com/squareup/picasso/NetworkBitmapHunterTest.java