Update .travis.yml

Remove travis_retry and add it to the documentation template.

Author: ottlinger

.travis.yml

@@ -7,8 +7,9 @@ php:
   - nightly
 
 before_script:
-  - travis_retry curl -s http://getcomposer.org/installer | php
-  - travis_retry php composer.phar install -n
+# In case of timeouts and build failures you may want to prepend 'travis_retry' to the following commands:
+  - curl -s http://getcomposer.org/installer | php
+  - php composer.phar install -n
 
 # Explicitly use the phpunit from composer, not any system-wide found
 script: