vendor: add github.com/ncw/dropbox-sdk-go-unofficial and remove github.com/stacktic/dropbox

In due course this will become github.com/dropbox/dropbox-sdk-go-unofficial
when the fate of https://github.com/dropbox/dropbox-sdk-go-unofficial/pull/14
has been decided.

vendor/github.com/ncw/dropbox-sdk-go-unofficial/dropbox/users_common/types.go

@@ -0,0 +1,37 @@
+// Copyright (c) Dropbox, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+// Package users_common : This namespace contains common data types used within
+// the users namespace
+package users_common
+
+import "github.com/ncw/dropbox-sdk-go-unofficial/dropbox"
+
+// AccountType : What type of account this user has.
+type AccountType struct {
+	dropbox.Tagged
+}
+
+// Valid tag values for AccountType
+const (
+	AccountTypeBasic    = "basic"
+	AccountTypePro      = "pro"
+	AccountTypeBusiness = "business"
+)