0.0.6 breaking changes

This release introduces the BUNDLE_DIR_NAME setting and removed BASE_URL setting.

BUNDLE_DIR_NAME is the name, actually relative path of the directory in which webpack will store the bundles. It is relative to it's parent static dir.

For example, if ./assets/ is your static dir and bundles are stored in ./assets/bundles/, then your BUNDLE_DIR_NAME should be bundles/