Set default hook selector to `css`
Add a test for default hook selector type
Remove useless `css` selector type key
Remove useless `id` selector type key, use default `css` selector type instead.
Consider longjohn as as dev dependency
Not useful for users anymore with wd
Still useful for dev
Allow updating Mocha and Growl
Update wd
Minor correction to respect code conventions

Code conventions: https://github.com/MattiSG/Watai/wiki/Code-conventions
Update dependencies

* update-dependencies:
  Update wd
  Allow updating Mocha and Growl
  Consider longjohn as as dev dependency Not useful for users anymore with wd Still useful for dev
Element locators with a string only default to CSS locators
Improve widget syntax

Fixes #33

* default-to-css-selectors:
  Minor correction to respect code conventions
  Remove useless `id` selector type key, use default `css` selector type instead.
  Remove useless `css` selector type key
  Add a test for default hook selector type
  Set default hook selector to `css`