Bump Graph API to supported 10.x version

Move php-http packages from require-dev to require

Update license

Cleanup composer file

Prepare 5.7.0 release

Bug fix for PHP 7.2

Merge pull request facebookarchive#942 from yguedidi/prepare_5_6_2

Prepare 5.6.2 release

Fix doc block syntax that interferes with Doctrine

Bump Graph API version to v2.10

* Added support for options with batch requests.

* Bumped Graph API version to v2.9.