add note about XULRunner version requirement and remove unnecessary JEP code
add note about XULRunner version requirement and remove unnecessary JEP code


bala17/webapp-xul-wrapper,bala17/webapp-xul-wrapper,heiserhorn/zotero,heiserhorn/zotero,bala17/webapp-xul-wrapper,neam/webapp-xul-wrapper,bala17/webapp-xul-wrapper,heiserhorn/zotero,heiserhorn/zotero,bala17/webapp-xul-wrapper,heiserhorn/zotero,neam/webapp-xul-wrapper,bala17/webapp-xul-wrapper,neam/webapp-xul-wrapper,bala17/webapp-xul-wrapper,bala17/webapp-xul-wrapper,neam/webapp-xul-wrapper,neam/webapp-xul-wrapper,neam/webapp-xul-wrapper,heiserhorn/zotero