Merge branch 'hotfix/7'

Close #7
Add support for setting layouts per-page
Merge pull request #9 from EvanDotPro/feature/allow-layout-selection

Add support for setting layouts per-page
[#9] Fix CS tools so tests will pass

- Added PHPUnit and php-cs-fixer as dev dependencies; modified Travis
  configuration to use these tools to run CI tasks.
Merge branch 'hotfix/9' into develop

Forward port #9