Add example for anonymous implementation of callback
Add example for different favors of implementing a lambda
Fixed test cases
Merge branch 'master' of https://github.com/codecentric/java8-examples
Tests for CollectingAndReducing.
Remove solutions ;-)
Test for another task.
Merge branch 'master' into solutions

Conflicts:
	src/main/java/de/codecentric/java8examples/streaming/CollectingAndReducing.java
	src/test/java/de/codecentric/java8examples/streaming/CollectingAndReducingTest.java
Fix one test.