Make explicit that excludes will strip urls by default
Make explicit that excludes will strip urls by default

Highlight how to disable strip-includes in config

Fixes #130 Exclude option doesnt work as described in readme

rcorp/vulcanize,threeday0905/vulcanize,Polymer/polymer-bundler,Polymer/tools,Polymer/tools,Polymer/tools,bendroid/vulcanize,Polymer/polymer-bundler,Polymer/tools,threeday0905/vulcanize,bendroid/vulcanize,rcorp/vulcanize,Polymer/polymer-bundler