Travis: no longer install from source and added PHP-7.0

Author: marc-mabe

.travis.yml

@@ -7,12 +7,13 @@ php:
  - 5.4
  - 5.5
  - 5.6
+ - 7.0
  - nightly
  - hhvm
 
 install:
  - if [ "$TRAVIS_PHP_VERSION" = "5.3.3" ]; then composer config -g disable-tls true; composer config -g secure-http false; fi
- - composer install -n --prefer-source
+ - composer install -n
 
 before_script:
  - CODE_COVERAGE=`echo $TRAVIS_PHP_VERSION | grep -v "hhvm" | wc -l`