title: R Likert package - change label levels
body: <p>I'm using the <a href="https://github.com/jbryer/likert" rel="nofollow">Likert</a> R package to generate graphs.  I have the following minimal R example:</p>
  
  <pre><code>library("likert")
  
  group = c("One", "Two", "One", "Two", "One")
  response = c(1, 2, 3, 3, 4)
  df = data.frame(response)
  levels = c("Strongly Disagree", "Disagree", "Neither Agree nor Disagree", "Agree", "Strongly Agree")
  df$response = recode(df$response, from=c(1, 2, 3, 4, 5), to=levels)
  df$response = as.factor(df$response)
  df$response = factor(df$response, levels=levels)
  
  likert_data = likert(df, grouping=group)
  
  plot(likert_data, legend.position="right", plot.percents=FALSE, plot.percent.low=FALSE, plot.percent.high=FALSE, plot.percent.neutral=FALSE, group.order=c("One", "Two"))
  + ggtitle("Title Here")
  + theme(axis.text.y = element_text(colour="black", size="10", hjust=0))
  + theme(axis.text.x = element_text(colour="black", size="10"))
  </code></pre>
  
  <p>This generates a graph, however, in the "Response" label on the right, it only lists 4 of the 5 Likert options.  It's missing "Strongly Agree" because it wasn't a data point.</p>
  
  <ul>
  <li><S>How can I force it to list all levels of the Likert data in the label?</S> (edit: resolved, see comment)</li>
  <li>How can I change the group labels on the left to a name that I specify?</li>
  </ul>