change "Extendibility" to "Extensibility"
change "Extendibility" to "Extensibility"

git-svn-id: 113d22c177a5f4646d60eedc1d71f196641d30ff@446 0ae5e6b2-d358-4f09-a895-f82f13dd62a4

fhieber/incubator-joshua,lukeorland/joshua,gwenniger/joshua,kpu/joshua,fhieber/incubator-joshua,fhieber/incubator-joshua,thammegowda/incubator-joshua,fhieber/incubator-joshua,thammegowda/incubator-joshua,kpu/joshua,gwenniger/joshua,thammegowda/incubator-joshua,lukeorland/joshua,kpu/joshua,fhieber/incubator-joshua,lukeorland/joshua,thammegowda/incubator-joshua,fhieber/incubator-joshua,lukeorland/joshua,fhieber/incubator-joshua,fhieber/incubator-joshua,kpu/joshua,lukeorland/joshua,lukeorland/joshua,thammegowda/incubator-joshua,thammegowda/incubator-joshua,gwenniger/joshua,gwenniger/joshua,fhieber/incubator-joshua,thammegowda/incubator-joshua,lukeorland/joshua,kpu/joshua,gwenniger/joshua,lukeorland/joshua,thammegowda/incubator-joshua,thammegowda/incubator-joshua,thammegowda/incubator-joshua,gwenniger/joshua,kpu/joshua,lukeorland/joshua