New commands

Added several new commands in-line with the W3C Webdriver API:

• fullscreenWindow
• minimizeWindow
• openNewWindow
• getWindowRect
• setWindowRect

Improvements

• waitForElementVisible doesn't throw an error anymore if the element cannot be found - #2148
• Added W3C Webdriver API compatibility support for .timeouts() command;
• Added suppressNotFoundErrors option for element selector properties to enable suppressing NoSuchElement errors when element is not found for commands such as .click() or .getText() etc.

Fixes

• Fixed #2155 - an issue with page object element selectors
• Fixed #2165 - an issue with page object relative urls
• Fixed #1301 - an issue with using .perform() with async callback
• Fixed #2168 - setWindowSize for geckodriver