sdkgen: logging: coloured output and indication of completion

Change-Id: Iba754e9c277bdcabab992f31905af964836059c4
Signed-off-by: Arnav Gupta <championswimmer@aokp.co>
add gcd funtion to envsetup.sh

  gcd - cd to any tracked git project from any other
  path in the build tree.

Change-Id: I8fde827dc51ac4006030712239f9ee6593b07c4c
Merge remote-tracking branch 'aokp/kitkat' into kitkat