Add browser test to keep track of browserify compability.
Add browser tests to npm test. Comment on eslint option.
Make package.json .8 friendly. Install karma-cli for travis.
Forgot one .8 style dependency.
Use newer npm on node .8 so travis stops complaining.
New stab at passing on .8
Merge pull request #1308 from eiriksm/feat/browserify-tests

Add browser test to keep track of browserify compability.