Add jolici binary to composer.

This provides the ability to install using composer rather than by
downloading the phar.  The binary file will be placed into a user-global
area where it can easily be accessed.
What change are you proposing exactly?  Updating the composer.json/lock for JoliCI?

From the look of things `docker-php` has some necessary commits that haven't been tagged (see #8, #11).  It's possible to `composer require stage1/docker-php:@dev` or `composer require stage1/docker-php:dev-master#fbafc6883272cc20206296778e991c857a8348e7`.  We could also see if we can get a new version tagged for docker-php.