Imports broken on case sensitive file system

[thdk]

As mentioned already in #9 some imports are using wrong casing when importing modules.

Filenames for Driver, Config and WinAppDriver are in PascalCasing while pageobject and by2 are in lowercase.

[licanhua]

Is it possible for you to create a pull request? I'm using windows and it's not case sensitive

[thdk]

@licanhua of course I'm on it.
Would you be interested in a PR to add eslint to avoid these errors in the future?

[licanhua]

sure

[licanhua]

Thanks. I just published 1.0.1 package. and please let me know if there is any problem