add phpwebserver to travis

.travis.yml

@@ -8,3 +8,4 @@ php:
 before_script:
   - curl -s http://getcomposer.org/installer | php
   - php composer.phar install --dev --prefer-source
+  - ./src/BeSimple/SoapClient/Tests/bin/phpwebserver.sh

src/BeSimple/SoapClient/Tests/bin/phpwebserver.sh

@@ -1,5 +1,12 @@
 #!/bin/bash
 
+PHPWEBSERVEROK="$( php -r "if (version_compare(phpversion(), '5.4', '<')) { echo 'nok'; } else { echo 'ok'; }" )"
+
+if [ "$PHPWEBSERVEROK" != "ok" ]; then
+    echo "No PHP webserver available before version 5.4..."
+    exit
+fi
+
 DIR="$( cd -P "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 cd $DIR