fixed type hint
added tests that check runtime restriction
added possibility to set a runtime restriction for a benchmark method
added test that detects a problem with the number of iterations in the result (in combination with runtime restriction)
fixed number of iterations in result
extracted constant
documented @maxRuntime annotation
added check to allow the usage of any class as formatter
added checks for provided formatter class
extracted check into separate method
added exception messages
Merge branch 'restrict_runtime_pull_request' of https://github.com/Matthimatiker/athletic
check if the file is actually a php file before parsing
check with \ReflectionClass and not with strpos!!!