Python 2.6.1 is what ships on OS X 10.6 and we want to support mozboot
there.
We include 3 fixes:
1) optparse doesn't like unicode as its initial argument
2) __init__(**kwargs) doesn't like unicode keys
3) subprocess does not have check_output
We took the easy solution of removing unicode_literals. This should have
no significant consequences.
This implements the OS X backend for the bootstrapper. It ensures that
the system is in the proper state to build Firefox by installing
required packages.
This was tested with a fresh install of OS X 10.8. Basic support for OS
X 10.6 and 10.7 is implemented, but not thorougly tested.
