I updated the batch files so they should work more consistently.

On my system (Windows 8 x64), Visual Studio 2010 isn't setting the directory when building the content project.

So what I changed is:
1. In the CSPROJ, use $(SolutionDir) to locate the batch file.  Rather than assuming the directory is correct, take the solution directory as the first parameter.

2. In the batch files, set up some variables first -- then use those rather than ..\..\..\..\..\ -- that way, they don't care what directory they are run from.

3.  In the PC batch file, instead of repeating a line five times -- once for each skin -- set up a comma separated variable and use a for loop.