Merge pull request #206 from mziccard/put-resumable-upload

Make resumable upload request use PUT instead of POST

Author: aozarov

gcloud-java-storage/src/main/java/com/google/gcloud/spi/DefaultStorageRpc.java

@@ -451,7 +451,7 @@ public void write(String uploadId, byte[] toWrite, int toWriteOffset, StorageObj
       long destOffset, int length, boolean last) throws StorageException {
     try {
       GenericUrl url = new GenericUrl(uploadId);
-      HttpRequest httpRequest = storage.getRequestFactory().buildPostRequest(url,
+      HttpRequest httpRequest = storage.getRequestFactory().buildPutRequest(url,
           new ByteArrayContent(null, toWrite, toWriteOffset, length));
       long limit = destOffset + length;
       StringBuilder range = new StringBuilder("bytes ");