Add better bash completion support

Now it is easy to add new completion scripts: just drop them in the
bash_completion.d directory.

Signed-off-by: Jacob Kiers <kiers@comandi.nl>

.gitignore

@@ -1,3 +1,4 @@
 *.cache
 sublime/User/Package Control.last-run
 sublime/User/Package Control.system-ca-bundle
+bash_completion.d

includes/bash_completion.bash

@@ -16,3 +16,11 @@ complete -F _tmux t
 
 # Add Gush completion.
 [ -f $HOME/.gush/.gush-autocomplete.bash ] && source $HOME/.gush/.gush-autocomplete.bash
+
+if [ -d $HOME/dotfiles/bash_completion.d ];
+then
+    for file in `find $HOME/dotfiles/bash_completion.d/ -type f -name '*.sh'`
+    do
+        source $file
+    done
+fi