Add error handling and programming categories to libraries.json

meta/libraries.json

@@ -6,7 +6,9 @@
     ],
     "description": "Operating system support, including the diagnostics support that will be part of the C++0x standard library.",
     "category": [
-        "System"
+        "System",
+        "Error-handling",
+        "Programming"
     ],
     "cxxstd": "03"
 }