Fix incremental build number on Darwin

Darwin does not include sha1sum, but it should have openssl.

Change-Id: If2b685c1478f9486bed21dfba0c655d9e02db72b
Merge "Fix incremental build number on Darwin" into cm-10.2
Use openssl instead of sha1sum

Change-Id: Iab8a74d4af6646104cb23312853f811a38bdec0d
Enable multiple custom toolchains

Change-Id: Ifcde6cbfe2782a7456f2b55386748227f593122a
Prepare Mackay ROM script with info

Change-Id: If0d39ab673397462dc43d6bec48f6142d802fe2b
Move the final messages to a more logical place

Change-Id: If9215f4d5c1938c6dfa68651a4ad1ad2bbb36b19
Restore the backup&restore function of gapps

Change-Id: Ie9abba55d4d0d0e3e9c92aeb428fcdbbf72d0efb
Allow the use of multiple Linaro toolchains

Enable building with a8 optimized version of Linaro
Thanks to christopher!
If not using custom toolchain use default toolchain folder

Change-Id: I7a35c2a318d17fe3013b056c08b9cb1347b7b329
More info during installation of a new ROM

Change-Id: I618511c3e0d47e931a02eec6429e871bd4b6b70a