Move php to php5 and add a php7 example that uses composer

php/phpunit.xml

@@ -1,15 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/3.7/phpunit.xsd"
-	backupGlobals="false" 
-	bootstrap="test/bootstrap.php"
-	colors="false" 
-	strict="true" 
-	verbose="true">
-
-	<testsuites>
-		<testsuite name="AllTests">
-			<directory suffix="_test.php">test</directory>
-		</testsuite>
-	</testsuites>
-</phpunit>