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
"Cannot run your app in the native emulator. Increase the timeout of the operation with the --timeout option. Alternatively, run the Android Virtual Device manager and increase the allocated RAM for the virtual device."