Fix the alternate recovery inclusion logic

Change-Id: Ifb59d61dae44dd639d7f891dc57bb326b06b1118
build: Add script to generate extra images

Change-Id: I53081c7a2b4f18bc8c8a27b04d311a6b078b2022
Merge branch 'cm-10.2' of https://github.com/CyanogenMod/android_build into jb-mr2