Replace retryCount with timeout

When starting Android emulator we were using --retryCount option, which is difficult to be explained. It it replaced with --timeout option, which is the allowed time to start the emulator device(wait to boot). The default value is 120 seconds. retryCount option is removed as it is not used anymore.

http://teampulse.telerik.com/view#item/278845
The check is ```> 0 ``` but message is ``` > 1```. I know it's nitpicking, but which one is your intent?