FEBUILD-36 Add default options
FEBUILD-36 Add default options

- Introduced defaultOptions and moved defaultServeOptions into the webpack task module.
- Split webpackWrapper into a 'build' and a 'serve' function.
- The 'build' function returns a Promise that is resolved on a successful build, and rejected with an error when it fails.
- Moved stats configuration for both build&serve into the parseOptions function and tried to simplify the merging of optionStats with default(build|serve)Stats.
- By default, webpack version and hash are printed.

onehippo/frontend-build,onehippo/hippo-build