Back to Java 1.4

- Java.version back to 1.4
- Removed powermock
- Added jUnit back to pom
- New resource directories to include ServiceLoader -files (src and
test)
- Cleaned mocks out of tests
Extending old ones

- If extension uses same metric type that has been used previously, it
checks all services before throwing error up
- Added logging to service.
Logging cleaning

- No error message when service is checking different providers
- When metricProvider not found, error thrown with all classes tried
(dropped logging level from error to debug at implementations)
- Getter for metricParams to allow extensions to use parameters, too