Merge pull request #247 from stof/jakzal-formatter-as-a-service

Formatter as a service
Fixed coding standards and phpdoc in the source code
Removed trailing whitespaces in the spec files
Merge pull request #250 from stof/cs_fixes

CS and phpdoc fixes
Updated the Prophecy constraint
Updated the changelog
Fixed the SuiteRunner spec on fast machines

If the SuiteRunner is too fast, the time difference is too small for PHP
and it is detected as being 0.