ct: Try to preserve newlines while copying.

- For some reason, copying a multi-line field's value in Chrome does so
  whilst preserving newlines.  In the desktop app on OSX, though,
  multiline values are copied as a single line.

- Although non-standard, the .innerText property of a Node will do
  better at preserving plain-text-formatting (newlines, and such) from
  child elements.  Where it doesn't exist, fallback to whatever JQuery's
  `.text()` uses.

app/scripts/views/fields/field-view.js

@@ -85,7 +85,7 @@ var FieldView = Backbone.View.extend({
         range.selectNodeContents(this.valueEl[0]);
         selection.removeAllRanges();
         selection.addRange(range);
-        copyRes = CopyPaste.copy(this.valueEl.text());
+        copyRes = CopyPaste.copy(this.valueEl[0].innerText || this.valueEl.text());
         if (copyRes) {
             selection.removeAllRanges();
             this.trigger('copy', { source: this, copyRes: copyRes });