Added docuemntation (javadoc) to D4Var.java.
Updated documentation (javadoc) in D4ScriptException.
Updated docuemntation (javadoc) in D4ScriptException.
Updated documentation (javadoc) package-info.
Updated package-info documentnation for net.zeddev.d4.util package.
Updated documentation (javadoc) for D4Intrinsics class.
Updated documentation (javadoc) for D4ScriptEngineFactory class.
Implemented the D4ScriptEngineFactory.getParameter() for the default keys.
Added associated documentation (javadoc).
Added javax.script service provider for jar file.