Add license to gemspec

[codegoalie]

I was trying to determine the licenses for my dependencies. I found that the RubyGems API will return the license, but only if it is specified in your gemspec file.

[tjsoftworks]

Can the owner of this project please comment on the state of this project? With the license being missing and the version of support being VMWare Fusion 3, I am wondering if the project is lacking energy or whether there is something fundamentally broken in the ability to bring this project up-to-date with VMWare Fusion 4 thru 8+? Thank you for any insight that the project owner or others might have....