PhantomJS should be installed via composer to reduce
the system requirements of acceptance tests.

The PhantomJS server should also be started
automatically when running acceptance tests.

Change-Id: I416359484e923e2a04f5213fb7f221bc7d0111e1
Resolves: #75498
Releases: master
Reviewed-on: https://review.typo3.org/47564


Reviewed-by: Susanne Moog <typo3@susannemoog.de>
Tested-by: Susanne Moog <typo3@susannemoog.de>
Reviewed-by: Daniel Goerz <ervaude@gmail.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>