ignore ctags file generated by tests
use ob_get_clean() instead of ob_end_clean()
add a centralized RepositoryDslParser + tests #408 #409
use RepositoryDslParser on (BitbucketProvider|GithubProvider):exixts()
we still have a lot of duplicated code on BitbucketProvider, GithubProvider and PeclProvider
relates to #408 #409