Changes:
- updated dependencies and allow only stable packages(@markuspoerschke)
- exclude some packages from the DependencyResolver (@aaukt)
- catch exception on api request and add bootstrap for proper autoloading (Klaus Bittrich)
- avoid HTTP Calls to Packagist for system packages like php, ext-xml or lib-icu (@andygrunwald)
- Set higher timeouts for update command (@andygrunwald)
- Use HTTPS for communication with Packagist (@andygrunwald)
- Replace guzzle/guzzle with guzzlehttp/guzzle (@andygrunwald)
- Cleanup branches that were mirrored in the past, but were now deleted in the remote (@andygrunwald)
- load external resolver.json containing list of renamed packages