This patch adds a 'visible' option to the Page.waitFor method, making
it possible to wait for the element to become actually visible.
References #89, #91.
This patch:
- adds event linting to the doclint
- improves `api.md` to add events and more information about
classes reported by events.
References #14.
This patch unifies Documentation.Method with Documentation.Property,
making it possible to verify sorting order across methods and
properties.
References #14.