• remove unnecessary files from package distributions [c9d79d3]
• fix issues in sameVariant that was introduced by underscore@1.15.
• reducing usage of underscore
• replace by native version whenever possible.
  (see https://github.com/you-dont-need/You-Dont-Need-Lodash-Underscore)
• cleanup package.json from unnecessary modules
• do not use util.callbackify in node-opcua-address-space so it can be browserified.