title: dataset does not appear in my R package
body: <p>I want to include a dataset in a package I'm building.  I followed all the steps in this <a href="http://kbroman.org/pkg_primer/pages/data.html" rel="nofollow">primer</a>.</p>
  
  <ul>
  <li>Create a data subdirectory and save the dataset as <code>myPackage/data/this_dataset.Rdata</code></li>
  <li>Create a <code>.R</code> file with <code>Roxygen2</code> comments, saved as <code>myPackage/R/this_dataset-data.R</code></li>
  <li>Include the line <code>LazyData: true</code> in the <code>DESCRIPTION</code> file.</li>
  </ul>
  
  <p>Then I install it:</p>
  
  <pre><code>&gt; library("devtools")
  &gt; setwd("D:/workspace/myPackage")
  &gt; install()
  Installing aPackage
  Skipping 1 package ahead of CRAN: data.table
  "C:/PROGRA~1/R/R-32~1.3/bin/x64/R" --no-site-file --no-environ --no-save --no-restore CMD INSTALL  \
    "D:/workspace/myPackage" --library="C:/Users/aUser/Documents/R/win-library/3.2" --install-tests 
  
  * installing *source* package 'aPackage' ...
  ** R
  ** data
  *** moving datasets to lazyload DB
  ** preparing package for lazy loading
  ** help
  *** installing help indices
  ** building package indices
  ** testing if installed package can be loaded
  * DONE (aPackage)
  
  Reloading installed aPackage
  </code></pre>
  
  <p>So it looks like it figured out that there are datasets.</p>
  
  <p>But then I can't get the dataset to load.  <code>print(this_dataset)</code> should work with lazy loading but returns "object not found" error.  <code>data(this_dataset)</code> returns "data set not found."  I do: <code>data(package='aPackage')</code> and get <code>no data sets found</code>.</p>
  
  <p>What am I doing wrong?</p>