Merge pull request #30 from dennisdegreef/cleanup

Added 'getting started' section
Merge pull request #31 from dennisdegreef/cleanup

Polished up documentation
Merge pull request #32 from dennisdegreef/cleanup

Modified Scrutinizer-CI config, added Travis-CI config, fixed up README.md
Merge pull request #33 from dennisdegreef/cleanup

Minimal PHP version is now 5.4, added xhprof extension for Travis-CI
Merge branch 'master' into cleanup