Release 5.17.0

### Bugfixes

Fix problem with wrapped trailing whitespace displaying incorrectly.

Prevent IME dialog from overlapping typed content in Chrome.

Improve measuring of characters near a line wrap.

[javascript mode](http://codemirror.net/mode/javascript): Improve support for `async`, allow trailing commas in `import` lists.

[vim bindings](http://codemirror.net/demo/vim.html): Fix backspace in replace mode.

[sublime bindings](http://codemirror.net/demo/sublime.html): Fix some key bindings on OS X to match Sublime Text.

### New features

[markdown mode](http://codemirror.net/mode/markdown): Add more classes to image links in highlight-formatting mode.
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