Added replace parameter for setText

Requires https://github.com/admc/wd/pull/333 to be pulled first.

I also want to create a test for this in keyboard-specs.js but I can add that in another pull. 

Tested with the wd.js change and it works for me.
the same is true for probably the entire java server project... anywhere params.get is invoked.

I think text is always sent by the node.js server. If it isn't then the bootstrap will crash.