Simulate DOM input event on .type()

[jennifer-shehane]

The DOM input event should be fired when the value of an <input> or <textarea> element is changed through cy.type().

For IE9 < support, the propertychange event should be fired when value of an <input> or <textarea> element is changed through cy.type().

[brian-mann]

Typing implements the spec and behavior of Chrome.

When cross browsers are used we don't simulate anything, real OS events are used so there is no need to add support for multiple browser.

Input event is now fired. Fixed in 0.8.0