qemubuilder - 0.90+b1 main

pbuilder implementation for QEMU.
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qemubuilder create -- builds QEMU cow base image.
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qemubuilder update -- updates QEMU cow base image.
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qemubuilder build -- builds package inside QEMU cow base image.
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Gives a pbuilder interface for emulated cross-building environments
using qemu.
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pbuilder is a tool for building and testing Debian package inside a
clean chroot, and qemubuilder implements similar experience over
emulated CPUs. This tool allows building package inside emulated
Debian environment for different CPU architectures supported by qemu.