title: move axis labels ggplot
body: <p>I have produced a fact graph in ggplot2 and the x axis title (bottom) is touching the scale values slightly (it's worsened when I plot to .pdf device).  How do I move the axis title down a smidge?</p>
  <pre><code>DF&lt;-structure(list(race = structure(c(3L, 1L, 3L, 2L, 3L, 1L, 2L, 
  2L, 2L, 3L, 2L, 1L, 3L, 3L, 3L, 3L, 2L, 1L, 2L, 3L), .Label = c(&quot;asian&quot;, 
  &quot;black&quot;, &quot;white&quot;), class = &quot;factor&quot;), gender = structure(c(1L, 
  1L, 1L, 2L, 1L, 2L, 1L, 1L, 1L, 2L, 2L, 1L, 2L, 2L, 2L, 1L, 1L, 
  2L, 2L, 2L), .Label = c(&quot;female&quot;, &quot;male&quot;), class = &quot;factor&quot;), 
      score = c(0.0360497844302483, 0.149771418578119, 0.703017688328021, 
      1.32540102136392, 0.627084455719946, -0.320051801571444, 
      0.852281028633536, -0.440056896755573, 0.621765489966213, 
      0.58981396944136, 1.95257757882381, 0.127301498272644, -0.0906338578670778, 
      -0.637727808028146, -0.449607617033673, 1.03162398117388, 
      0.334259623567608, 0.0912327543652576, -0.0789977852804991, 
      0.511696466039959), time1 = c(75.9849658266583, 38.7148843859919, 
      54.3512613852158, 37.3210772390582, 83.8061071736856, 14.3853324033061, 
      79.2285735003004, 31.1324602891428, 22.2294730114138, 26.427263191766, 
      40.5529893144888, 19.2463281412667, 8.45085646487301, 97.6770352620696, 
      61.1874163107771, 31.3727683430548, 99.4155144857594, 79.0996849438957, 
      21.2504885323517, 94.1079332400361)), .Names = c(&quot;race&quot;, 
  &quot;gender&quot;, &quot;score&quot;, &quot;time1&quot;), class = &quot;data.frame&quot;, row.names = c(NA, 
  -20L))
  
  
  require(ggplot2)
  p &lt;- ggplot(DF, aes(score, time1, group=gender))
  p + geom_point(aes(shape=19)) + facet_grid(race~gender) + scale_x_continuous('BLAH BLAH') + 
  scale_y_continuous('Some MOre Of theat Good Blahing') 
  </code></pre>
  <p>In my data BLAH BLAH is touching the numbers.  I need it to move down.  How?</p>