Fix typo in docs
Merge pull request #6037 from jzwinck/patch-2

Fix typo in docs
don’t import IPython.parallel until it’s used

in IPython.html.notebookapp
avoid unnecessary imports of numpy

in IPython.parallel.map

also drop crazy-old numeric / numarray support
delay imports of zmq.ssh.tunnel

until they are actually used.

Prevents unnecessary imports of Paramiko