Update composer.json to loosen buzz requirements

On a project where we are using 0.9 buzz and looking into using Behat with Sahi, but we end up with a buzz conflict because of this.
Return result of $conditionResult after `wait` method call.

Needed for https://github.com/Behat/Mink/issues/301
Return result of $conditionResult after `wait` method call.
Tests added.

Needed for https://github.com/Behat/Mink/issues/301
Merge pull request #8 from aik099/driver-wait-return-value

Return result of $conditionResult after `wait` method call.
Merge pull request #7 from andrerom/patch-1

Update composer.json to loosen buzz requirements