title: Formatting number output of sliderInput in shiny
body: <p>A good example of my question is found in the Movie Review example in the Shiny Gallery here:</p>
  
  <p><a href="http://shiny.rstudio.com/gallery/movie-explorer.html">http://shiny.rstudio.com/gallery/movie-explorer.html</a></p>
  
  <p>There is a slider on the left hand side panel called "Year Released" which ranges between 1940 and 2014.
  Here is the code for it from the <code>ui.R</code> </p>
  
  <p><code>sliderInput("year", "Year released", 1940, 2014, value = c(1970, 2014))</code></p>
  
  <p>You will notice that the formatting of the years when you use the slider are of the form:</p>
  
  <p><code>"1,940"   "2,014"</code>   with a comma separating the first digit from the last three.</p>
  
  <p>I know that one can use <code>dateRangeInput</code>in Shiny but this requires the variable to be in a date format.  For data variables that are simply numbers referring to years such as this example, is there a simple way to format the number output to remove the comma?  I can't seem to figure this out,  something that seems simple.</p>