Text report was using a wrong way to render the summary when option "showOnlySummary" was setted as true
Merge pull request #207 from lcobucci/1.3

Text report was using an undefined attribute to render the summary (only when the option "showOnlySummary" was marked as true)
Also test with PHP 5.5 on Travis CI
Merge branch '1.2' into 1.3
Merge branch '1.3'
Fix dependency
Merge branch '1.3'
Fix dependency