Add Java 8 lambda-friendly factory method for StringChunks
Add Java 8 lambda-friendly factory method for ByteChunks
Add java 8 samples for async documentation
Add java 8 samples for WS documentation
Add java 8 samples for akka integration documentation
Extract code samples from java test documentation
Add java 8 samples for java tests documentation
Merge pull request #2572 from pvlugter/java8-docs

Java 8 samples in documentation