Prompt-toolkit

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Fixes:
- Fix in auto suggestion: hide suggestion when accepting input.

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New features:
- Mouse support. (Scrolling and clicking for vt100 terminals. For Windows only
clicking.) Both the autocompletion menus and buffer controls respond to
scrolling and clicking.
- Added auto suggestions. (Like the fish shell.)
- Stdout proxy become thread safe.
- Linewrapping can now be disabled, instead we get horizontal scrolling.
- Line numbering can now be relative. Like the vi 'relativenumber' option.

Fixes:
- Fixed excessive scrolling in Windows.
- Bugfix in search highlighting.
- Copy all words during repetition of Ctrl-W presses.
- The 'libs' folder has been removed.
- Fix in MultiColumnCompletionsMenu: don't create very big columns.

Backwards-incompatible changes:
- Disable search by default in KeyBindingManager.
- Separated abort/exit key bindings. Disabled by default in KeyBindingManager.
- 'Ignore' became the default on_abort action in `Application`.
- 'Ignore' became the default accept_action in `Buffer`.
- The layout processors have been refactored. The API is changed.
- `SwitchableValidator` has been renamed to `ConditionalValidator`.
- `WindowRenderInfo` has several incompatible changes.
- Margins have been refactored completely. Now it's the window that has the
margin instead of `BufferControl`. Is is both much more performant and
flexible.

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Fix:
- Leaving of alternate screen on Windows.

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New features:
- Added MANIFEST.in
- Better support for multiline prompts in shortcuts.
- Added Document.set_document method.
- Added 'default' argument to `shortcuts.create_default_application`.
- Added `align_center` option for `TokenListControl`.
- Added optional key bindings for full page navigation. (Moved key bindings
from pyvim into prompt-toolkit.)
- Accepts default_char in BufferControl for filling the background.
- Added InFocusStack filter.

Fixes:
- Small fix in TokenListControl: use the right Char for aligning.

Backwards-incompatible changes:
- Removed deprecated 'tokens' attribute from GrammarLexer.

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New features:
- run_in_terminal now returns the result of the called function.
- Made history attribute of Buffer class public.
- Added support for sub CommandLineInterfaces.
- Accept optional vi_state parameter in KeyBindingManager.

Fixes:
- Pop-up menu positioning. The menu was shown too often above instead of below
the cursor.
- Fix in Control-W key binding. When there is only whitespace before the
cursor, delete the whitespace.
- Rendering bug fix in open_in_editor: run editor using cli.run_in_terminal.
- Fix in renderer. Correctly reserve the vertical space as required by the
layout.
- Small fix in Margin ABC.
- Added __iter__ to History ABC.
- Small bugfix in CommandLineInterface: create correct eventloop when no
eventloop was given.
- Never schedule a second repaint operation when a previous was not yet
executed.

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New features:
- Added `prompt_toolkit.layout.utils.iter_token_lines`.
- Allow `None` values on the focus stack.
- Buffers can be readonly. Added `IsReadOnly` filter.
- `eager` behavior for key bindings. When a key binding is eager it will be
executed as soon as it's matched, even when there is another binding that
starts with this key sequence.
- Custom margins for BufferControl.

Fixes:
- Don't trigger autocompletion on paste.
- Added `pre_run` parameter to CommandLineInterface.
- Correct invalidation of BeforeInput and AfterInput.
- Correctly handle transparency. (For floats.)
- Small change in the algorithm to determine Window dimensions: keep in the
bounds of the Window dimensions.

Backwards-incompatible changes:
- There a now a `Lexer` abstract base class. Every lexer should be an instance
of that class, and Pygments lexers should be wrapped in a `PygmentsLexer`
class. `prompt_toolkit.shortcuts` still accepts Pygments lexers directly for
backwards-compatibility.
- BufferControl no longer has a `show_line_numbers` argument. Pass a
`NumberedMargin` instance instead.
- The `History` class became an abstract base class and only defines an
interface. The default history class is now called `InMemoryHistory`.