Adds license to gemspec

This allows RubyGems to display buffet's license information.

Change-Id: I690a129a7e7c4de44341e5ce87c0477484ea0b7c
Reviewed-on: https://gerrit.causes.com/17679
Reviewed-by: Aiden Scandella <aiden@causes.com>
Tested-by: Aiden Scandella <aiden@causes.com>
Bump version for license update

Change-Id: Ifebed417056bb316e12e98e8897bf207980410f5
Reviewed-on: https://gerrit.causes.com/17680
Reviewed-by: Aiden Scandella <aiden@causes.com>
Tested-by: Aiden Scandella <aiden@causes.com>