add MIT license to gemspec
Merge pull request #13 from leifg/add_license_to_gemspec

License missing from gemspec
add ruby 2.1.0 to travis
only allow 2.1.0 to fail
add ruby head
set 2.1.0 as default version
cleanup travis.yml
add generic rbx
add dependencies for rbx
Merge pull request #14 from leifg/add_ruby21

Add ruby 2.1.0 to travis
update rubyzip version
update webmock
pin rubyzip to at least 1.0