Merge remote-tracking branch 'origin/subresource_depth' into subresource_depth

Author: Nightbr

.travis.yml

@@ -35,7 +35,8 @@ before_install:
   - export PATH="$PATH:$HOME/.composer/vendor/bin"
 
 install:
-  - if [[ ! $deps ]]; then composer update --prefer-dist --no-progress --no-suggest --ansi; fi
+  - if [[ $deps = 'beta' ]]; then composer config minimum-stability beta; fi
+  - if [[ $deps != 'low' ]]; then composer update --prefer-dist --no-progress --no-suggest --ansi; fi
   - if [[ $deps = 'low' ]]; then composer update --prefer-dist --no-progress --no-suggest --prefer-stable --prefer-lowest --ansi; fi
 
 script: