Adding support for custom interfaces

[dstgermain]

#33

[jsf-clabot]

All committers have signed the CLA.

[dstgermain]

Hey guys, saw the issue. I'm actually in need of this functionality to add locale based skips to the interface. Let me know your thoughts on this.

[christian-bromann]

Could you add a test for this?

[dstgermain]

Sure, no problem.

[dstgermain]

Added some tests, one just mimics another test that uses the default ui to check to make sure the hooks still work. And another checks to make sure the ui loaded into the global. Let me know if there's anything else.

[dstgermain]

Haven't heard from anyone in awhile on this. We ended up using something else.

[Matthematic]

@dstgermain what else did you use? This functionality would be very useful so I'm surprised it was abandoned.

[dstgermain]

@Matthematic - We ended up forking it. Then we ended up rewriting webdriver.io with async awaits and less restrictions. It ended up being a very light library.