Convenience Sikuli client factory method

[buzdin]

The following code is too complex

String sessionId = remoteWebDriver.getSessionId();
SikuliExtensionClient client = new SikuliExtensionClient(host, port, sessionId);

Create factory method, which builds Sikuli client on RemoteWebDriver object instance without the need to pass any other parameters.

[echoAlexey]

This will require to bring dependency on selenium-server in sikuli client only for passing Driver to constructor. I suggest to leave constructor as it is.

[volkovs]

@echoAlexey I agree it looks like extra step from user's point of view. Also looks like not a big issue, since client already has dependency on selenium-server (it creates RemoteWebDriver in the first place). If you don't want to make this dependency propagated we can set the scope to provided. What do you think?

[echoAlexey]

Agree, will include in next release. Will look into optional scope for it.