Requirements::checkForRequirements()

	public function checkForRequirements()
	{
		foreach ($this->requirements as $name => $data) {
			if (! call_user_func_array('call_user_func_array', $data['callback'])) {
				continue;
			}

			$this->checkedRequirements[] = $name;
		}

		$success = count($this->requirements) == count($this->checkedRequirements);
		do_action($success? 'bp_ld_sync/requirements_checked' : 'bp_ld_sync/requirements_failed', $this);
	}