Merge pull request #1 from eguaj/master

Corrected conflict with installer program overwrite
version(version): 26 (refs #4463)
refactor(buildtools): Added buildTools submodule (refs #4463)
refactor(package): Targets for producing the xul-runtime-fr-26.0.tar.gz from Firefox's fr.xpi (refs #4463)
fix(package): Update xulruntimes_fr_url to point to xul-runtime-fr-26.0.tar.gz (refs #4463)