Prompt-toolkit

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New features:
- Improved performance significantly for processing key bindings.
(Pasting text will be a lot faster.)
- Added 'M' Vi key binding.
- Added 'z-' and 'z+' and 'z-[Enter]' Vi keybindings.
- Correctly handle input and output encodings on Windows.

Bug fixes:
- Fix bug when completion cursor position is outside range of current text.
- Don't crash Control-D is pressed while waiting for ENTER press (in run_system_command.)
- On Ctrl-Z, don't suspend on Windows, where we don't have SIGTSTP.
- Ignore result when open_in_editor received a nonzero return code.
- Bug fix in displaying of menu meta information. Don't show 'None'.

Backwards incompatible changes:
- Refactoring of the I/O layer. Separation of the CommandLineInterface
and Application class.
- Renamed enable_system_prompt to enable_system_bindings.

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New features:
- Handling of trailing input in contrib.regular_languages.

Bug fixes:
- Default message in shortcuts.get_input.
- Windows compatibility for contrib.telnet.
- OS X bugfix in contrib.telnet.

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New features:
- Support for editing in Vi block mode. (Only enabled for
prompt_toolkit>=1.0.8.)

Fixes:
- Handle two Jedi crashes. (GitHub ptpython issues 136 and 91.)

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Fixes:
- Fix in completer. Don't hang when pasting a long string with many
backslashes.
- Fix Python2 bug: crash when filenames contain non-ascii characters.
- Added `pt[i]pythonX` and `pt[i]pythonX.X` commands.
- Compatibility with IPython 5.0.

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Bugfix in ptipython: reset input buffer before every read in run().

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