Merge pull request jackmoore#130 from jclement/master

If textarea is empty, and placeholder text exists, use placeholder text for sizing.

jquery.autosize.js

@@ -155,7 +155,15 @@
 					setWidth();
 				}
 
-				mirror.value = ta.value + options.append;
+				if (!ta.value) {
+					// If the textarea is empty, copy the placeholder text into 
+					// the mirror control and use that for sizing so that we 
+					// don't end up with placeholder getting trimmed.
+					mirror.value = ($(ta).attr("placeholder") || '') + options.append;
+				} else {
+					mirror.value = ta.value + options.append;
+				}
+
 				mirror.style.overflowY = ta.style.overflowY;
 				original = parseInt(ta.style.height,10);