In contrib/android, added a README.md, updated the build script's
documentation, made it more configurable, and added a step at the
end to create a deployable (command-line-based) installer.
Added a condition that prevents the package from being built if one with
has already been built for the same git version.
Updated README for clarity and added success output to the build script
One final tweak to increase the visibility of the success statement
Fixed an issue caused by $VERSION being declared after it was used