Merge pull request rdp#28 from ukd1/patch-1

Fix unescaped quote in example
Awesome thanks

Author: rdp

README.textile

@@ -180,7 +180,7 @@ end
 You can also add arbitrary lines to the output 
 
 <pre>
-plot.arbitrary_lines << "set ylabel \"y label" font \"Helvetica,20\""
+plot.arbitrary_lines << "set ylabel \"y label\" font \"Helvetica,20\""
 </pre>
 
 See more in the examples folder.  Also since this is basically just a wrapper for gnuplot itself, you should be able to do anything that it can do (demos: