[FLINK-1312] [streaming] OutputSelector changed to SAM-type to allow java 8 lambdas for splitting
[streaming] Java 8 WordCount example added for streaming

[streaming] Documentation added for streaming java 8 support
Updated java 8 package to match flink-examples standards

Renamed org.apache.flink.example package to org.apache.flink.examples
Default data is provided from flink-java examples