Add PutBucket and ListBuckets service

pkg/storage/storage_errors.go

@@ -10,12 +10,28 @@ type ObjectExists struct {
 	key    string
 }
 
+type BucketNameInvalid struct {
+	bucket string
+}
+
+type BucketExists struct {
+	bucket string
+}
+
 type ObjectNotFound GenericError
 
 func (self ObjectNotFound) Error() string {
-	return "Not Found: " + self.bucket + "#" + self.path
+	return "Object not Found: " + self.bucket + "#" + self.path
 }
 
 func (self ObjectExists) Error() string {
 	return "Object exists: " + self.bucket + "#" + self.key
 }
+
+func (self BucketNameInvalid) Error() string {
+	return "Bucket name invalid: " + self.bucket
+}
+
+func (self BucketExists) Error() string {
+	return "Bucket exists: " + self.bucket
+}