title: Overriding "Variables not shown" in dplyr, to display all columns from df
body: <p>When I have a column in a local data frame, sometimes I get the message <code>Variables not shown</code> such as this (ridiculous) example just needed enough columns.</p>
  <pre><code>library(dplyr)
  library(ggplot2) # for movies
  
  movies %.% 
   group_by(year) %.% 
   summarise(Length = mean(length), Title = max(title), 
    Dramaz = sum(Drama), Actionz = sum(Action), 
    Action = sum(Action), Comedyz = sum(Comedy)) %.% 
   mutate(Year1 = year + 1)
  
     year    Length                       Title Dramaz Actionz Action Comedyz
  1  1898  1.000000 Pack Train at Chilkoot Pass      1       0      0       2
  2  1894  1.000000           Sioux Ghost Dance      0       0      0       0
  3  1902  3.555556     Voyage dans la lune, Le      1       0      0       2
  4  1893  1.000000            Blacksmith Scene      0       0      0       0
  5  1912 24.382353            Unseen Enemy, An     22       0      0       4
  6  1922 74.192308      Trapped by the Mormons     20       0      0      16
  7  1895  1.000000                 Photographe      0       0      0       0
  8  1909  9.266667              What Drink Did     14       0      0       7
  9  1900  1.437500      Uncle Josh's Nightmare      2       0      0       5
  10 1919 53.461538     When the Clouds Roll by     17       2      2      29
  ..  ...       ...                         ...    ...     ...    ...     ...
  Variables not shown: Year1 (dbl)
  </code></pre>
  <p>I want to see <code>Year1</code>! How do I see all the columns, preferably by default.</p>