Prototype: handleWebpackResult can now hide specific webpack warnings.
Updated hacking.md
config.webpackWarningFilters is now passed from jester-watch/batch to handleWebpackResult().
Gave filterWebpackWarnings() an actual implementation:
it now checks the webpackWarningFilters-config and uses it to filter warnings.
Extracted the sanity check of the warning filters to a separate function.
The filter-config check now returns a boolean and logs to the console instead of throwing exceptions.
Merge pull request #10 from odegroot/filterWebpackWarnings

Filter webpack warnings