Removed faulty .gitattributes.

They cause git to think that files have been modified although they have not, and makes it impossible to revert the files to un-changed form.
See http://stackoverflow.com/questions/5009096/files-showing-as-modified-directly-after-git-clone 's first answer.

lib/jsoncpp/src/lib_json/sconscript

@@ -1,8 +1,8 @@
-Import( 'env buildLibrary' )
-
-buildLibrary( env, Split( """
-    json_reader.cpp 
-    json_value.cpp 
-    json_writer.cpp
-     """ ),
-    'json' )
+Import( 'env buildLibrary' )
+
+buildLibrary( env, Split( """
+    json_reader.cpp 
+    json_value.cpp 
+    json_writer.cpp
+     """ ),
+    'json' )