Moves Console_Table into Composer file.
Adds symfony/yaml to composer.json.
Removes Yaml lib from VCS.
Removes manual require of httpserver. Removes utilities for fetching and checking libs.
Oops. Replaces needed line for DrupalServer invocation.
Removes unneccesary DRUSH_PEAR_BASE_URL const.
Removes slow PEAR package in favour of direct GitHub repo commmit.
Fixes travis fail with autoloader.
Travis runs composer install prior to testing.
Moves autoloader to a more sensible place.
Fix #127. Fetch external libs with composer, and use Composer autoloader.

In order to install Drush, you now need to run composer install in order to fetch the dependencies. If you want to keep your existing Drush, just git pull and then run composer.install.

In order to keep your Drush updated, run composer update after updating your Drush.