This is the beginning of Mozilla's new build system.
In this patch, we have a Python sandbox tailored for execution
of Python scripts which will define the build system. We also have a
build reader that traverses a linked set of scripts.
More details are available in the thorough README.rst files as part of
this patch.
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Bug 784841 - Part 2b: Option to not descend into child moz.build files; r=ted
