fixed for ZK 7 customized scrollbar issue
bug fixed
fine tune for Opera driver
support browser setting from command line with -Dbrowser=xxx
fine tune
fine tune
fine tune
fine tune for current selenium version
fix Opera driver issue
fine tune
make the waiting time more long when the includingAnimation is true.
fine tune for safari and firefox
fine tune for Opera and Safari
fine tune for Opera
Merge branch 'master' of https://github.com/zkoss/ztl into parallel-improve