updates epub3 gem to 1.0.0.alpha3
updates epub3 gem to 1.0.0.alpha3

robertpanzer/asciidoctorj,ysb33r/asciidoctorj,mojavelinux/asciidoctorj,danielgrycman/asciidoctorj,asciidoctor/asciidoctorj,solent/asciidoctorj,mojavelinux/asciidoctorj,robertpanzer/asciidoctorj,ancho/asciidoctorj,lefou/asciidoctorj,danielgrycman/asciidoctorj,ysb33r/asciidoctorj,asciidoctor/asciidoctorj,asciidoctor/asciidoctorj,abelsromero/asciidoctorj,ancho/asciidoctorj,robertpanzer/asciidoctorj,lefou/asciidoctorj,lefou/asciidoctorj,lefou/asciidoctorj,ysb33r/asciidoctorj,solent/asciidoctorj,solent/asciidoctorj,mojavelinux/asciidoctorj,abelsromero/asciidoctorj,ancho/asciidoctorj,solent/asciidoctorj,danielgrycman/asciidoctorj,ysb33r/asciidoctorj,abelsromero/asciidoctorj,danielgrycman/asciidoctorj