only test against different Symfony versions with PHP 5.5

This change was backported from the 1.1 development branch.
fix the pagination output for empty result lists

When the API returned an empty video result set, the panda:video:list
command showed a misleading pagination info:

  Page 1 of 0

This informational output is no longer printed for empty result sets.

This change was backported from the 1.1 development branch.
include the Scrutinizer badge

This change was backported from 1.1 development branch.
improve container extension tests

Use base test case classes provided by the package
matthiasnoback/symfony-dependency-extension-test to make test for the
service container extension and the compiler pass more readable and
maintainable.
prepare the 1.0.1 release
Merge branch '1.0'

Conflicts:
	.travis.yml
	CHANGELOG.md