Merge pull request #348 from mapbox/pre-gyp-semver

Use a looser semver for node-pre-gyp

package.json

@@ -37,7 +37,7 @@
     },
     "dependencies": {
         "nan": "1.3.0",
-        "node-pre-gyp": "0.5.27"
+        "node-pre-gyp": "~0.5.27"
     },
     "bundledDependencies": [
         "node-pre-gyp"