Merge pull request #7 from Weborama/master

Added URLPartitionerBolt
URLInjector extends ConfigurableTopology; removed dependency to Hadoop-based XML configuration
renamed Fetcher and moved it to bolt package; reorganised packages for protocol stuff; FetcherBolt now relies on standard Stom configuration
moved indexerbolt and parserbolt to bolt package
Finished removing XML based configuration
moved metrics related code to a dedicated package
Merge branch 'DigitalPebble-master'