Add READ_EXTERNAL_STORAGE required by aosp 4.4

Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
Fix onDissmissListener for 4.0.3 devices (not supported as builder)

Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
Fix NPE because mSrcView not being set until picture view is displayed

Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
Add isValidFragment definition required by aosp 4.4

Signed-off-by: Jorge Ruesga <jorge@ruesga.com>