Started implementation of applet and servlet options
 * Added a finishedModuleHeader method to close declarations of module headers.
 * Added a checkInModuleHeader to check if a syntax is currently in module
   header or not.
 * Header modules syntax now extends ModuleHeader.
Fixed scheme source files so all module headers are specified together
Fixed loading of servlet definitions
 * When a module is a servlet, we load up some servlet definitions
   in the Scheme language instance.