switch methods to be context (options) based

makeRelease was being passed rootDir, destDir and gitRoot, all of them
being availablein options respecitvelt with buildroot, destDir and
gitroot.

I have updated makeRelease() to rely on options.  Some arguments were
simply passed down to export() exportExtension() makeTarFile(), I have
updated those methods to rely on options as well.

More calls needs to be updated...

Change-Id: Ie7522f87fe0f381808a4a78b13266a0f68868bf6