Remove loader in runtime bits

The loader was mistakenly included in the runtime bits causing issues in IE. The loader is now fully separated from the runtime.

Breaking change:
The loader should now be included in the webpack config as aurelia-fontawesome-loader/loader (or aurelia-fontawesome-loader/loader?pro)

Remove binding behavior as view dependency

Let the fontawesome binding behavior be included manually from now on by the application, instead of magically by the loader which caused some problems. From now on, one must include the loader as an aurelia plugin during boot:

aurelia.use.plugin(PLATFORM.moduleName('aurelia-fontawesome-loader'))