Add paste to plt, fix spurious newlines in cell mode.

IPython/core/interactiveshell.py

@@ -2122,7 +2122,7 b' class InteractiveShell(Configurable, Magic):'
         # This seems like a reasonable usability design.
         last = blocks[-1]
         if len(last.splitlines()) < 2:
-            self.runcode('\n'.join(blocks[:-1]))
+            self.runcode(''.join(blocks[:-1]))
             self.runlines(last)
         else:
             self.runcode(cell)

IPython/lib/pylabtools.py

@@ -113,7 +113,9 b' def import_pylab(user_ns, backend, import_all=True, shell=None):'
             shell.register_post_execute(flush_svg)
         else:
             from IPython.zmq.pylab.backend_payload_svg import paste
-            user_ns['paste'] = paste
+            from matplotlib import pyplot
+            # Add 'paste' to pyplot and to the user's namespace
+            user_ns['paste'] = pyplot.paste = paste
 
     if import_all:
         exec("from matplotlib.pylab import *\n"