Add Webpack 2 Functionality

This essentially only adds new syntax for Webpack 2 but we bumped a major version cause it's kinda a big change

#54

Here's a couple interesting links about Webpack 2:

• webpack/webpack#1981
• webpack/webpack#2873
• https://gist.github.com/mxstbr/85b1c37276162b6ceb33
• https://gist.github.com/sokra/27b24881210b56bbaff7