make JobDetailImpl.JobType virtual to support Spring.NET
make JobDetailImpl.JobType virtual to support Spring.NET

sean-gilliam/quartznet,quartznet/quartznet,quartznet/quartznet,sean-gilliam/quartznet,sean-gilliam/quartznet,sean-gilliam/quartznet,quartznet/quartznet,quartznet/quartznet,quartznet/quartznet,sean-gilliam/quartznet