Add new features: XML streaming encoding and streaming data for Hibernate datasource and GetObservation response

Add two new features to the SOS 4.x which can be activate via settings
- XML Streaming encoding
  * Stream SOAPEnvelope and add as previously encoded SOS 2.0 responses
  * Stream SOS 2.0 GetObservation responses and OM_Observation
  * No DOM-Tree: less memory usage, larger response size
- Streaming data for Hibernate datasource and GetObservation responses
  * only metadata is queried in the DAO
  * Observation values are queried 
    * before the encoding is called, if XML streaming encoding is not supported
    * in the encoder if XML streaming encoding is supported
  * smaller latency time, less memory usage, larger response size

Fix for problem with missing schema location in SOS 1.0.0 Capabilities, see #45