Addressed a potential issue in build automation script

On my machine, the *build-release.sh* script yields the following error which prevents the unit tests from running:

```
"\Exude\BuildRelease.msbuild" (default target) (1) ->
(Test target) ->
  \Exude\BuildRelease.msbuild(28,5): error : 
      The xunit task requires either Assembly or Assemblies, but not both.

    0 Warning(s)
    1 Error(s)
```

To make the unit tests run, I changed the *Build.config* file to point in the *Exude.UnitTests* folder location.

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To reproduce this you have to invoke the *git clean* command prior to running the *build-release.sh* script (or make a fresh *git clone* of the repository).