Make library more easily used by other

[Dermah]

From babel-polyfill:

This will emulate a full ES2015+ environment and is intended to be used in an application rather than a library/tool.

If you are looking for something that won't modify globals to be used in a tool/library, checkout the transform-runtime plugin.

When I was using roar-mongo I was getting errors about babel-polyfill only being allowed once.

This change uses the transform-runtime plugin instead of babel-polyfill

[Dermah]

Can confirm 0.3.0-alpha is working in a client project. It throws warnings while being webpack'd, but that's a different issue.