Updated CM release key for recovery

Change-Id: I4aad710101cb6fbbd9df2a3137f9a5ae0e0432da
add suffix on unpackbootimg target

Change-Id: I934361c451a380e0377648ed111a7580c4cfb04e
Merge branch 'cm-10.2' of https://github.com/CyanogenMod/android_build into cm-10.2