Use support.v7.palette to get header tint

Todo in later cls:
-save the extracted tint, so we don't have unnecessary delay
 when returning from the edit screen
-animate the change of tint color. This matters for tablet
 and after the photo changes.

Change-Id: I11685c1489a5c7b49f46c250033f4f303b076ef6
diff --git a/Android.mk b/Android.mk
index 95ac2f3..a9cc38f 100644
--- a/Android.mk
+++ b/Android.mk
@@ -22,6 +22,7 @@
     android-common \
     guava \
     android-support-v13 \
+    android-support-v7-palette \
     android-support-v4 \
     android-ex-variablespeed \
     libphonenumber \