Revised the POM files
* all external dependencies in plugins should be <optional>true</optional>
* radargun dependencies don't need the exclusions
* brought some query dependencies (needed in future commits)
StressTest: option for fixed period requests (instead of executing them at maximum pace)
Properties can be defined using nested XML
* Works for stages
* Still TODO for services and reporters
Querying using DSL (removed old query support)
* you can form any condition/projection/sort etc. in the QueryStage
* example objects: TextObject and NumberObject enabled for both Lucene & Protobuf queries
* example data generators
Minor fixes