add license information to the gemspec

[jordimassaguerpla]

This way we can get this info when using rubygems.org api

[rafaelfranca]

Journey was merged inside Rails so I think we don't need to add this

[jordimassaguerpla]

Sure? I mean journey is still distributed as a separate gem, right?

[rafaelfranca]

Not the version corresponding to the master branch

[jordimassaguerpla]

ok. I did not know journey had been merge to rails master branch.

[jordimassaguerpla]

thanks for the clarification