updates error message to account for bad address error
removes _.bind in favor of the native Object.prototype.bind
removes all but one instance of "var me = this" [fix #869]

Add Inspector Tutorial to Finding Elements

Add Inspector Images

Fixed Images

Point Images to Appium

Use pressBack

pressBack blocks until back is pressed. This is much better than the old
implementation which returns immediately.

Dump without disconnecting the current session

The old way of viewing the page source broke the current uiautomator session. A
lot of effort went into detecting a failed session and then restarting. It turns
out we can access the source from within a session.

Use uiautomator pressKeyCode

The adb solution doesn't wait until the key has finished which causes problems
in tests. uiautomator's built in pressKeyCode is much better.

Added aliases for UIAKeyboard and UIAKey.

Use uiautomator screenshot

uiautomator has built in support for taking screenshots. There's no need for an
external jar.