Created $[$name] retrieve for environment variables.

Global.cpp

@@ -2,6 +2,7 @@
 #include "Exception.h"
 #include "__mysql.h"
 #include <iostream>
+#include <stdlib.h>
 
 namespace jet {
 
@@ -45,6 +46,8 @@ namespace jet {
 	    // TODO: should only allow CGI variable name. Allow variable substitution.
 	 } if(variable.ifNext("@")) {
 	    // TODO: should only allow environment variables. Allow substitution.
+	 } if(variable.ifNext("$")) {
+	    return getenv(renderVariableName(name, variable).c_str());
 	 } else {
 	    coreutils::MString splitName = renderVariableName(name, variable);
 	    splitName.split(".");