title: How to reduce the gap between the map and title using rworldmap
body: <p>I have used the below data and the code to color the countries using rworldmap.</p>
  
  <pre><code>ddf = read.table(text="country value
       USA    10
        UK    30
    Sweden    50
     Japan    70
     China    90
   Germany   100", header=T)
  
    library(rworldmap)
    spdf &lt;- joinCountryData2Map(ddf, joinCode="NAME",  
                                nameJoinColumn="country")
  
    mapCountryData(spdf, nameColumnToPlot="value", catMethod="fixedWidth")
  </code></pre>
  
  <p>The map is looking fine. The problem I am having is to reduce the gap between the map and the title of the map. Also at the bottom I am having a huge space at the end of the map. I would like to reduce both the spaces.</p>