Fix issue where " is required

When building on appveyor, the linter exited with 1.
To fix this, we are putting an \ before "

Author: Gum-Joe

lifecycleScripts/install.js

@@ -36,7 +36,7 @@ return installPrebuilt();
 function installPrebuilt() {
   console.info("[nodegit] Fetching binary from S3.");
   var npg = pathForTool("node-pre-gyp");
-  return exec('"'+ npg + '" install --fallback-to-build=false')
+  return exec("\""+ npg + "\" install --fallback-to-build=false")
     .then(
       function() {
         console.info("[nodegit] Completed installation successfully.");