reuse old session by setting session_id

[vitstradal]

Sometimes it is useful to use existing session in selenium, like:

my $driver = Selenium::Driver::Remote->new({session_id => $sess_id}); 

So this patch check if user want connect to existing session and skips creating new one.

[gempesaw]

Oh, this seems like a pretty good idea. Are those changes all it takes to make it work? Are you interested in adding tests for this ?

[vitstradal]

Yes, this is all. I tried create some tests, but not sure if it is enough. I'm not familiar with creating mock files.

[gempesaw]

thanks!