LeanTween is an efficient tweening engine for the Unity 3d engine
To use LeanTween move LeanTween.cs (inside the Assets/Plugins folder) into your Plugins directory of your current Unity project.
Documentation can be found here: http://dentedpixel.com/LeanTweenDocumentation/classes/LeanTween.html
Examples here: https://github.com/dentedpixel/LeanTween/archive/master.zip