Don't check the cache for ?write=true GETs

Kinda defeats the whole purpose otherwise.

lib/get.js

@@ -34,6 +34,12 @@ function get (uri, timeout, nofollow, staleOk, cb) {
   cacheUri = cacheUri.replace(/:/g, '_')
   var cache = path.join(this.conf.get('cache'), cacheUri, ".cache.json")
 
+  // If the GET is part of a write operation (PUT or DELETE), then
+  // skip past the cache entirely, but still save the results.
+  if (uri.match(/\?write=true$/))
+    return get_.call(this, uri, timeout, cache, null, null, nofollow, staleOk, cb)
+
+
   fs.stat(cache, function (er, stat) {
     if (!er) fs.readFile(cache, function (er, data) {
       try { data = JSON.parse(data) }