Types defined in Standard Assets scripts are placed in a SampleAssets folder which is not prioritized during compilation. This leads to missing type exceptions if aforementioned types are used in user scripts.

This can be fixed by moving SampleAssets folder contents to Standard Assets folder.

Steps to reproduce:
1. Create a new project and import Effects package
2. Create UnityScript file which would import UnitySampleAssets.ImageEffects; and reference one of the Image Effects. Compilation will fail reporting missing types.