Complete module import lines in addition to variable names

Complete module import lines in addition to variable names

Available when using ipython v0.11. Completions on lines starting with
"from " or "import " are supplied by
IPython.core.completerlib.module_completion

ipython v0.11 configuration:

(setq python-shell-interpreter "ipython"
      python-shell-completion-setup-code
      "from IPython.core.completerlib import module_completion\n"
      python-shell-module-completion-string-code
      "';'.join(module_completion('''%s'''))\n"
      python-shell-completion-string-code
      "';'.join(get_ipython().Completer.all_completions('''%s'''))\n")