ColorTo on GUIText: use GUIText.color property instead on creating instance material

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What steps will reproduce the problem?
1. Create a GUIText object
2. Apply a ColorTo operation on it

What is the expected output? What do you see instead?
The color change is applied on the instance material. Since Unity has 
introduced a color property for GUIText it´s recommended to use this filed 
instead of instantiating a new material for the GUIText element. Moreover this 
approach is resource-saving.

What version of the product are you using? On what operating system?
2.0.46

Original issue reported on code.google.com by andre.br...@gmail.com on 17 May 2014 at 4:42