Added Homebrew completion plugin
diff --git a/completion/brew.completion.bash b/completion/brew.completion.bash
new file mode 100644
index 0000000..10c8168
--- /dev/null
+++ b/completion/brew.completion.bash
@@ -0,0 +1,3 @@
+if [ -f `brew --prefix`/etc/bash_completion ]; then
+  . `brew --prefix`/etc/bash_completion
+fi