Prompt-toolkit

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Fixed:
- syntax error in 0.27

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Backwards-incompatible changes:
- Complete refactoring of the layout system. (HSplit, VSplit, FloatContainer)
as well as a list of controls (TokenListControl, BufferControl) in order to
design much more complex layouts.
- ptpython code has been moved to a separate repository.

New features:
- prompt_toolkit.contrib.shortcuts.get_input has been extended.

Fixed:
- Behavior of Control+left/right/up/down.
- Backspace in incremental search.
- Hide completion menu correctly when the cursor position changes.

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Backwards-incompatible changes:
- Refactoring of the key input system. (The registry which contains the key
bindings, the focus stack, key binding manager.) Overall much better API.
- Renamed `Line` to `Buffer`.

New features:
- Added filters as a way of disabling/enabling parts of the runtime according
to certain conditions.
- Global clipboard, shared between all buffers.
- Added (experimental) "merge history" feature to ptpython.
- Added 'C-x r k' and 'C-x r y' emacs key bindings for cut and paste.
- Added g_, ge and gE vi key bindings.
- Added support for handling control + arrows keys.

Fixed:
- Correctly handle f1-f4 in rxvt-unicode.

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Fixed:
- Package did not install on Python 2.6/2.7.

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Backwards-incompatible changes:
- Completer.get_completions now gets a complete_event argument.

New features:
- For ptpython: filename completion inside Python strings.
- prompt_toolkit.contrib.regular_languages added.
- prompt_toolkit.contrib.pdb added. (Experimental PDB front-end.)
- Support for multiline toolbars.
- asyncio support added. (Integration with asyncio event loop.)
- WORD parameter added to Document.word_before_cursor.

Fixed:
- Small fixes in Win32 terminal output.
- Bug fix in parsing of CPR response.

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New features:
- contrib.completers added.

Fixed:
- Improved j/k key bindings in Vi mode.
- Don't leak internal variables into ptipython shell.
- Initialize IPython extensions.
- Use IPython's prompt.
- Workarounds for Jedi crashes.