Change Log:

- Improved API documentation:
- New Pilot-API based command line client: https://github.com/saga-project/BigJob/wiki/BigJob-Command-Line-Client
- Decentral ComputeDataService implementation (>50% performance improvement): https://github.com/saga-project/BigJob/blob/master/examples/pilot-api/example-pilot-api-decentral.py
- Support for Bliss (>=0.2.3)
- Implemented workaround for pip issue
- Various bug fixes