Add a pseudo classname to junit output.
Add a pseudo classname to junit output.

This makes it somewhat less flat, but the only distinction is betwee
lua test files, not within describe blocks.

ryanplusplus/busted,xyliuke/busted,istr/busted,sobrinho/busted,DorianGray/busted,leafo/busted,nehz/busted,azukiapp/busted,mpeterv/busted,o-lim/busted,Olivine-Labs/busted