Do self-update on Composer before running Composer install.
Do Composer install without dev. Change in composer's default dependency behaviour.
Increase dependency to a different PHP version.
Remove 5.3.x checks on Travis CI
Merge pull request #22 from miccheng/HOT-FIX

Fix Travis CI builds due to change in default installation behaviour of Composer. Composer now checks out the development only packages by default. Adding --no-dev will make it ignore packages declared in "require-dev" parameter.