Added the defmacro/js macro-defining macro.
Added the defmacro/js macro-defining macro.

JackDanger/parenscript,JackDanger/parenscript,JDReutt/parenscript,fredericksilva/Parenscript,VincentToups/parenscript,JackDanger/parenscript,manuel/parenscript,3b/parenscript,vsedach/Parenscript