test patch from rvagg/nan#239 on all travis build targets

package.json

@@ -36,7 +36,7 @@
         "url": "git://github.com/mapbox/node-sqlite3.git"
     },
     "dependencies": {
-        "nan": "~1.5.0",
+        "nan": "https://github.com/springmeyer/nan/tarball/patch-3",
         "node-pre-gyp": "~0.6.1"
     },
     "bundledDependencies": [