Prompt-toolkit

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Fixes:
- Fix in output_screen_diff: reset correctly.
- Ignore flush errors in vt100_output.
- Implemented <num>gg Vi key binding.
- Bug fix in the renderer when the style changes.

New features:
- TokenListControl can now display the cursor somewhere.
- Added SwitchableValidator class.
- print_tokens function added.
- get_style argument for Application added.
- KeyBindingManager got an enable_all argument.

Backwards incompatible changes:
- history_search is now a SimpleFilter instance.

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Fixes:
- Fixed layout.py example.
- Fixed eventloop for Python 64bit on Windows.
- Fix in history.
- Fix in key bindings.

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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:
- Added get_prompt_tokens parameter to create_default_layout.
- Show prompt in bold by default.

Bug fixes:
- Correct cache invalidation of DefaultPrompt.
- Using text_type assertions in contrib.telnet.
- Removed contrib.shortcuts completely. (The .pyc files still
appeared incorrectly in the wheel.)

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New features:
- WORD parameter for WordCompleter.
- DefaultPrompt.from_message constructor.
- Added reactive.py for simple integer data binding.
- Implemented scroll_offset and scroll_beyond_bottom for Window.
- Some performance improvements.

Bug fixes:
- Handling of relative path in PathCompleter.
- unicode_literals for all examples.
- Visibility of bottom toolbar in create_default_layout shortcut.
- Correctly handle 'J' vi key binding.
- Fix in indent/unindent.
- Better Vi bindings in visual mode.

Backwards incompatible changes:
- Moved prompt_toolkit.contrib.shortcuts to prompt_toolkit.shortcuts.
- Refactoring of contrib.telnet.