Added Markov3 and more prefab files:
* Added 'list' command for name generation
* renamed MarkovGenerators depending on lookahead
+ added MarkovGenerator with lookahead of 3
+ added several prefab files
Added readme and fixed errors
Added seed value in constructor to allow for deterministic generation
A few test to verify the correctness
Merge remote-tracking branch 'origin/develop'

Conflicts:
	src/main/java/org/terasology/namegenerator/logic/console/NameGeneratorCommands.java
	src/main/java/org/terasology/namegenerator/logic/generators/Markov2NameGenerator.java
Added english and fantasy town names