Word-wrap output correctly in the notebook; prevents excessive scrolling.

Firefox seems to not honor it correctly, but Webkit browsers (Chrome,
rekonq, Safari) do.

IPython/frontend/html/notebook/static/css/notebook.css

@@ -351,3 +351,8 b' div.text_cell_render {'
 
 .shortcut_descr {
 }
+
+/* Word-wrap output correctly.  This is the CSS3 spelling, though Firefox seems
+   to not honor it correctly.  Webkit browsers (Chrome, rekonq, Safari) do.
+ */
+pre, code, kbd, samp { white-space: pre-wrap; }