Upd .travis

Author: rkit

.travis.yml

@@ -5,12 +5,17 @@ php:
   - 5.6
   - hhvm
 
+cache:
+  directories:
+    - $HOME/.composer/cache
+
 before_install:
   - pip install --user codecov
 
 install:
-  - composer self-update
-  - composer install
+  - travis_retry composer self-update && composer --version
+  - export PATH="$HOME/.composer/vendor/bin:$PATH"
+  - travis_retry composer install --prefer-dist --no-interaction
 
 before_script:
   - mysql -e 'create database filemanager_yii2_tests;'