Created command line method to be invoked by make.

make needs some means for copying resource files, stripping them,
and generating the intermediate java/xml files. This calls into
the same code used by the gradle plugin to do it. When aapt
work has completed, this can be removed entirely and replaced
by a simple shell script.

Change-Id: Ie6e1fda8fa27892cc74a13f1404ab064f6210270