Added simple support for terraform

Not providing help for the speicifc commands yet but at least complete
the available commands as a starting point

completion/available/terraform.completion.bash

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+# Bash Terraform completion
+
+_terraform()
+{
+   local cmds cur colonprefixes
+   cmds="apply destroy get graph init output plan push          \
+      refresh remote show taint version"
+
+   COMPREPLY=()
+   cur=${COMP_WORDS[COMP_CWORD]}
+   # Work-around bash_completion issue where bash interprets a colon
+   # as a separator.
+   # Work-around borrowed from the darcs work-around for the same
+   # issue.
+   colonprefixes=${cur%"${cur##*:}"}
+   COMPREPLY=( $(compgen -W '$cmds'  -- $cur))
+   local i=${#COMPREPLY[*]}
+   while [ $((--i)) -ge 0 ]; do
+      COMPREPLY[$i]=${COMPREPLY[$i]#"$colonprefixes"}
+   done
+
+        return 0
+} &&
+complete -F _terraform terraform