Merge pull request #7 from phug-php/fix/issue-6-nullable-types

Make nullable types explicit

Fix code style

Merge pull request #4 from phug-php/feature/issue-3-namespace-statement

Handle usage in namespaced templates

Use new CodeNode::preventFromTransformation() method

Merge pull request #2 from phug-php/enable-renderer

Fix pug-php compatibility

Ignore tests files in the distributed package

Implement $firstMixin / $firstComponent function

Ignore platform reqs for PHP nightly Travis build