Requirements updated for Symfony 3

Thanks to contributions by @soullivaneuh, the composer requirements are now updated to allow for usage together with Symfony 3.

The bundle now also suggests installation of symfony/console, which makes it possible to use the commands provided in the bundle to interact with HipChat.

Configuration option for "request_timeout" added

Thanks to contributions from @soullivaneuh, the request_timeout option from the hipchat/hipchat-php library is now supported through configuration.

Information about the option is added to the README.

Configuration options for "verify_ssl" and "proxy_address" added

Thanks to the contributions by @shirshir, the bundle now has support for the verify_ssl and proxy_address configuration options from the hipchat-php (https://github.com/hipchat/hipchat-php) library.

Console commands added

Two console commands has been added to provide functionality to send messages and change the topic of a room.

NOTE: These commands are not yet covered by the test suite. Tests will be added soon.

@pgodel is the contributor of those two commands – thank you for the contribution!