Export works with filenames having spaces.

* The fix was to put the filename in double quotes in the
  Content-Disposition header.
* Export As/Clear All have been renamed to Export and Clr All

IPython/frontend/html/notebook/handlers.py

@@ -233,13 +233,13 b' class NotebookHandler(web.RequestHandler):'
         last_mod, name, data = nbm.get_notebook(notebook_id, format)
         if format == u'json':
             self.set_header('Content-Type', 'application/json')
-            self.set_header('Content-Disposition','attachment; filename=%s.json' % name)
+            self.set_header('Content-Disposition','attachment; filename="%s.json"' % name)
         elif format == u'xml':
             self.set_header('Content-Type', 'application/xml')
-            self.set_header('Content-Disposition','attachment; filename=%s.ipynb' % name)
+            self.set_header('Content-Disposition','attachment; filename="%s.ipynb"' % name)
         elif format == u'py':
             self.set_header('Content-Type', 'application/x-python')
-            self.set_header('Content-Disposition','attachment; filename=%s.py' % name)
+            self.set_header('Content-Disposition','attachment; filename="%s.py"' % name)
         self.set_header('Last-Modified', last_mod)
         self.finish(data)
 

IPython/frontend/html/notebook/templates/notebook.html

@@ -68,7 +68,7 b''
                         </select>
                     </span>
                     <span class="section_row_buttons">
-                        <button id="download_notebook">Export As</button>
+                        <button id="download_notebook">Export</button>
                     </span>
                 </div>
             </div>
@@ -95,7 +95,7 b''
                     <span id="toggle_output" class="section_row_buttons">
                         <button id="collapse_cell">Collapse</button>
                         <button id="expand_cell">Expand</button>
-                        <button id="clear_all_output">Clear All</button>
+                        <button id="clear_all_output">Clr All</button>
                     </span>
                     <span class="button_label">Output</span>
                 </div>