New packaging method

The new ./package.sh script provides all necessary functionality to
produce packages without having version numbers in version-controlled
files.

The debian changelog, and rhel copyright files are now removed and auto
generate as build products into build/, which is added to the ignore
file.

Signed-off-by: Galo Navarro <galo@midokura.com>
Merge pull request #117 from srvaroa/v1.3-packaging

New packaging method