Fixed inconsistent and trailing whitespace

This means that all tabs used in indentation are now 4 spaces and that
there should be no more trailing whitespace.

Ill also look into creating a pre-commit hook that will prevent this
from happening in the future.

Fixes #105

include/internal/catch_interfaces_config.h

@@ -41,7 +41,7 @@ namespace Catch {
         Auto,
         Yes,
         No
-    }; };    
+    }; };
 
     class TestSpec;