rename package

Merge branch 'master' of https://github.com/miguelbcr/RxPaparazzo

Conflicts:
	app/src/androidTest/java/com/miguelbcr/ui/rx_paparazzo/sample/ApplicationTest.java
	rx_paparazzo/src/main/java/com/miguelbcr/ui/rx_paparazzo/interactors/DownloadImage.java