Move license into README
Add Libspotify module with #binary_path, #release_name, VERSION and GEM_VERSION
Specify gem license in gemspec
Clarify API visibility in Libspotify
Our gem description *is* our gem summary
Use armv5 build on all arm versions

It’s supported by them all, and in my experience armv5 release
is much more stable, for some weird reason.
Extend build support for JRuby and (hopefully in the future) ARM

See https://github.com/rubygems/rubygems/issues/532