acu161195 update gemspec

Need to fix mime-types because 2.x is Ruby 1.9+
acu161195 bump bundler version
acu161195 bump gem version
acu161195 update gemspec and license

We are using the MIT license word-for-word.
acu161195 use semantic versioning for json and bundler
Merge pull request #58 from rightscale/salmon_14_06_acu161195_bump_version

Salmon 14 06 acu161195 bump version