Add a plugin.zsh folder so we can load this with zgen

bitbucket-git-helpers.plugin.zsh

@@ -0,0 +1,19 @@
+#!/usr/bin/env zsh
+#
+# Copyright 2016 Joseph Block <jpb@apesseekingknowledge.net>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Add our plugin's bin diretory to user's path
+PLUGIN_D=$(dirname "$0")
+export PATH="${PATH}:${PLUGIN_D}/bin"