Update travis configuration to use composer phpunit
BUG: Broken links in the 'Dependent pages' tab

The double quotes in links href is 'escaped' even though the surrounding quotes are single quotes
Merge pull request #1033 from stojg/broken-links-dep-pages-3.0

BUG: Broken links in the 'Dependent pages' tab
Merge pull request #1009 from tractorcow/pulls/3.0-travis

Update travis configuration to use composer phpunit