Move phpunit / behat config to root .dist files

Summary:
- Move behat.template to behat.yml.dist in project root
- Move phpunit.xml -> phpunit.xml.dist
- Remove extra params for phpunit/behat/phpspec in bin/test

Test Plan:
bin/phpunit
bin/behat
(both without config now)
Push to travis and check bin/tests runs ok

Reviewers: aMoniker, shadowhand

Reviewed By: shadowhand

Differential Revision: https://phabricator.ushahidi.com/D553