LPS-44366 Added interface for JavaScript Minifiers
LPS-44366 Move logic around

Extract logic in MinifierUtil to new YUIJavaScriptMinifier.java
LPS-44366 Added Closure Compiler
LPS-44366 Add Minifier using closure compiler
LPS-44366 Update MinifierUtil to use JavaScriptMinifier interface
LPS-44366 Update logic to use new MinifierUtil interface
LPS-44366 Deprecate methods
LPS-44366 adding simple compile level options
LPS-44366 Setting closure compiler as default minimizer