add gitattributes and fix whitespace issues

src/test/run-pass/class-impl-parameterized-trait.rs

@@ -48,7 +48,7 @@ class cat : map<int, bool> {
   }
 
   fn size() -> uint { self.meows as uint }
-  fn insert(+k: int, +v: bool) -> bool { 
+  fn insert(+k: int, +v: bool) -> bool {
     if v { self.meows += k; } else { self.meows -= k; };
     true
   }