Need some help, I can't figure out how to close the publisher window once my record has been saved.
Can someone tell me how to do this?

Controller:

public class ContestEntryController {

    public Contest_Tracking__c contest  { get; private set; }
    public BCS__c hub                   { get; private set; }

    public ContestEntryController() {

        //Capture choices
        contest = new Contest_Tracking__c(); 

        //Find Hub for user
        hub = [Select Id FROM BCS__c WHERE User__c = :UserInfo.getUserId()];
    }

    public PageReference save() {
        try {
            contest.Contest_Name__c     = contest.Picklist_Contest_Name__c;
            contest.Related_to__c       = hub.Id;
            contest.User__c             = UserInfo.getUserId();
            contest.Keyword__c          = contest.Picklist_Contest_Name__c;
            insert(contest);
            return null;
        } catch(System.DMLException e) {
            ApexPages.addMessages(e);
            return null;
        }

    }
}

Page:

<apex:page controller="ContestEntryController" showHeader="false" sidebar="false" tabStyle="Contest_Tracking__c">

    <script> function refreshFeed() {
    Sfdc.canvas.publisher.publish({name : 'publisher.close', payload : {feed: true}}); }
  </script>

    <apex:form style="width:90%;margin:auto;" >
        <apex:pageBlock mode="edit" >
            <!-- Enter Contest --> 
            <apex:pageBlockSection columns="2" showHeader="true" title="Create Contest Entry">
                <apex:outputLabel value="Contest Name"/>
                             <apex:actionRegion >
                              <apex:inputField value="{!contest.Picklist_Contest_Name__c}" required="true">
                              <apex:actionSupport event="onchange" reRender="MarchMadness"/>
                              </apex:inputField>
                             </apex:actionRegion>
                <apex:outputLabel value="Contest Vote"/>
                             <apex:actionRegion >
                              <apex:inputField value="{!contest.Picklist_Contest_Vote__c}" required="true">
                              <apex:actionSupport event="onchange" reRender="MarchMadness" />
                              </apex:inputField>
                             </apex:actionRegion>
            </apex:pageBlockSection>

            <!-- Button Section -->
            <apex:pageBlockButtons location="bottom">
                <apex:commandButton value="Submit Entry" action="{!save}" oncomplete="refreshFeed();" />
            </apex:pageBlockButtons>

            <!-- Rules -->
            <apex:pageBlockSection columns="1" showHeader="true" title="Contest Rules">
                <apex:pageblocksection id="MarchMadness" columns="1">
                <apex:outputPanel styleClass="rules" style="width:80%" rendered="{!contest.Picklist_Contest_Name__c == 'March Madness'}">
                    1. Be sure to complete you bracket at CBS Sport to be eligible for prizes.<br />
                    2. Guess your champion here to earn 10 points for Culture Club.<br /> <br />
                    If you did not get a CBS Sports bracket invitation, please email Jim.<br /><br />
                </apex:outputPanel>
                    </apex:pageblocksection>
            </apex:pageBlockSection>
        </apex:pageBlock>
    </apex:form>

    <!-- CSS -->
    <style>
        .logo {
        float: right;
        width: 200px;
        margin: -65px 20px 0 0;
        padding: 20px;
        }
        .rules {
        color: black;
        font-size: 18px;     
        float: left;
        width: 100%;
        }
    </style>
</apex:page>