Install Drush 7.x

gistfile1.txt

#0. Update Drush to 7.x
	/* Taken from https://github.com/drush-ops/drush */
	a. Install Composer Globally

		curl -sS https://getcomposer.org/installer | php
		sudo mv composer.phar /usr/local/bin/composer

	b. Make sure Composer's global bin directory is on the system PATH

		sed -i '1i export PATH="$HOME/.composer/vendor/bin:$PATH"' $HOME/.bashrc
		source $HOME/.bashrc

	c. To install Drush 7.x (dev) which is required for Drupal 8:

		composer global require drush/drush:dev-master