Fix proguard on windows

This fixes proguard on windows.

can someone test on linux?


There were 2 problems:

This is not valid:
-libraryjars "'"C:\Program Files\Java\jdk1.7.0_51\jre\lib\rt.jar"'" 
-> Double quote followed by simple quote then double quote again closes the quote therefore Program file is unknown

And this:
 -injars '"C:\Users\Benoit\.m2\repository\org\scala-lang\scala-library\2.8.0\scala-library-2.8.0.jar"(!META-INF/maven/**,!META-INF/MANIFEST.MF)' 

-> You first need a double quote and then a simple quote