title: R/ggplot: Vertical strip text with facet_wrap
body: <p>I'm using ggplot in R to plot several conditions with facet_wrap.
  I'd like to put the strip with the plot name on the vertical axis on the right instead of on top. </p>
  
  <p>This is an example:</p>
  
  <pre><code>library(ggplot2)
  dat&lt;- data.frame(name= rep(LETTERS[1:5], each= 4), value= rnorm(20), time= rep(1:5, 4))
  gg&lt;- ggplot(data= dat, aes(x= time, y= value)) +
      geom_point() +
      facet_wrap(~ name, ncol= 1)
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/HwPFn.png" alt="enter image description here">
  Here the plot names (A, B, C, D, E) are on top, I'd like them to be on the right as in here:</p>
  
  <pre><code>gg + facet_grid(name ~ .)
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/DLirH.png" alt="enter image description here"></p>
  
  <p>Is there an easy switch to do it? 
  (I'm not using <code>facet_grid</code> since I'd like to use the options <code>nrow</code> and <code>ncol</code> that come with <code>facet_wrap</code>).</p>
  
  <p>Thanks! Dario</p>
  
  <pre><code>sessionInfo()
  R version 3.0.1 (2013-05-16)
  Platform: x86_64-apple-darwin10.8.0 (64-bit)
  
  locale:
  [1] en_GB.UTF-8/en_GB.UTF-8/en_GB.UTF-8/C/en_GB.UTF-8/en_GB.UTF-8
  
  attached base packages:
  [1] stats     graphics  grDevices utils     datasets  methods   base     
  
  other attached packages:
  [1] ggplot2_0.9.3.1
  
  loaded via a namespace (and not attached):
   [1] colorspace_1.2-4   dichromat_2.0-0    digest_0.6.4       grid_3.0.1        
   [5] gtable_0.1.2       labeling_0.2       MASS_7.3-29        munsell_0.4.2     
   [9] plyr_1.8.1         proto_0.3-10       RColorBrewer_1.0-5 Rcpp_0.11.0       
  [13] reshape2_1.2.2     scales_0.2.3       stringr_0.6.2      tools_3.0.1       
  </code></pre>