Added gulp bash completion.

completion/available/gulp.completion.bash

@@ -0,0 +1,23 @@
+#!/bin/bash
+# Borrowed from grunt-cli
+# http://gruntjs.com/
+#
+# Copyright (c) 2012 Tyler Kellen, contributors
+# Licensed under the MIT license.
+# https://github.com/gruntjs/grunt/blob/master/LICENSE-MIT
+# Usage:
+#
+# To enable bash <tab> completion for gulp, add the following line (minus the
+# leading #, which is the bash comment character) to your ~/.bashrc file:
+#
+# eval "$(gulp --completion=bash)"
+# Enable bash autocompletion.
+function _gulp_completions() {
+# The currently-being-completed word.
+local cur="${COMP_WORDS[COMP_CWORD]}"
+#Grab tasks
+local compls=$(gulp --tasks-simple)
+# Tell complete what stuff to show.
+COMPREPLY=($(compgen -W "$compls" -- "$cur"))
+}
+complete -o default -F _gulp_completions gulp