add PHP 5.6 to .travis.yml
Merge pull request #58 from sasezaki/patch-1

add PHP 5.6 to .travis.yml
Fragments with rules
Removed hhvm-nightly
Handling empty documents
Merge pull request #61 from goetas/issue_50

Handling empty documents
Merge pull request #1 from Masterminds/master

Update from origin