Cannot create campaign with custom values through api

At the moment it is possible to create campaign's throught the api.
Although when your campaign has custom fields, it's not possible to create a campaign with values for this custom fields.

Executing $result = civicrm_api3('Campaign', 'create', array(
'sequential' => 1,
'title' => "",
'custom_field' => "value custom field",
));

has the same result as if you would omit the custom field value.

This is because the basic create method is used for the api create call.
(In api/v3/Campaign.php we have)
function civicrm_api3_campaign_create($params)

{ return civicrm_api3_basic_create(_civicrm_api3_get_BAO(__FUNCTION__), $params); }

If we change this code (as in other entities wich do allow custom fields) we can make this work.

function civicrm_api3_campaign_create($params)

{ $value = array(); _civicrm_api3_custom_format_params($params, $values, 'Campaign'); $params = array_merge($values, $params); $campaignBAO = CRM_Campaign_BAO_Campaign::create($params); _civicrm_api3_object_to_array($campaignBAO, $campaign[$campaignBAO->id]); return civicrm_api3_create_success($campaign, $params, 'campaign', 'create', $campaignBAO); }

I'll try to make a pull request