iOS Simulator build refactor

Do not require iOS provision & cert, because the server does not need them anymore

Refactor the code to break the huge monolithic class into dedicated commands

Restructure the help of emulate command to make it platform-dependant
Before running your app in the Android emulator, verify that your system meets the following requirements.
    * Verify that you are running the Telerik AppBuilder CLI on a Windows, OS X, or Linux system. 
    * Verify that you have installed the Android SDK.
    * Verify that you have added the following Android SDK directories to the PATH environment variable:
        platform-tools
        tools