Upgrade Zinc 0.3.1-M1, close #1470
Drop tgz bundle, close #1471
Move to proper extractor package
Minor optimization
Rename whatever into dontValidate, close #1468
minor clean up
Optimize TypeCaster: handle String fast
 Optimize TypeCaster: turn valueClazz into def
Optimize ELCompiler: compute static String validation only once
Optimize ELCompiler: compute multiparts with a StringBuilder
Optimize ExpressionWrapper: create Success once
Optimization: create None.success once
Minor optimizations