Add aurora-config-mode

Major mode for editing Apache Aurora configuration files.  It's derived
from Python mode adding Aurora and Pystachio helpers, structs and types
for syntax coloring along with some Aurora inspection commands and key
bindings.

Repository is at https://github.com/bdd/aurora-config-mode.el
I am the maintainer of the package.

Tested build and installation.

```
 • Building recipe aurora-config-mode ...
/usr/local/opt/emacs/bin/emacs --no-site-file --batch -l package-build.el --eval "(let ((package-build-stable nil) (package-build-archive-dir (expand-file-name \"./packages\" pb/this-dir))) (package-build-archive 'aurora-config-mode))"

;;; aurora-config-mode

Fetcher: github
Source: bdd/aurora-config-mode.el

Cloning git://github.com/bdd/aurora-config-mode.el.git to /Users/bdd/src/melpa/working/aurora-config-mode/
Loading vc-git...
Saving file /Users/bdd/src/melpa/packages/aurora-config-mode-20140520.34.el...
Wrote /Users/bdd/src/melpa/packages/aurora-config-mode-20140520.34.el
Wrote /Users/bdd/src/melpa/packages/aurora-config-mode-readme.txt
File: /Users/bdd/src/melpa/packages/aurora-config-mode-20140520.34.entry
Built in 0.063s, finished at Tue May 20 00:39:43 2014
 ✓ Wrote 8 -rw-r--r--  1 bdd  staff   3.6K May 20 00:39 ./packages/aurora-config-mode-20140520.34.el
8 -rw-r--r--  1 bdd  staff   194B May 20 00:39 ./packages/aurora-config-mode-20140520.34.entry
8 -rw-r--r--  1 bdd  staff   494B May 20 00:39 ./packages/aurora-config-mode-readme.txt
 Sleeping for 0 ...
sleep 0
```