Adjusted the Highstock widget to not use a hardcoded 'ext' import path
Merge branch 'add-composer'
Added in an initial version of an ActiveHighStock widget

Inspired by http://www.yiiframework.com/extension/activehighstock,
this widget uses the existing widgets in this repo as a base,
giving us an easier time setting things up and upgrading in the future.
Merge branch 'active-highstock-widget'