Pymux

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Fixes:
- Fix for OS X El Capitan: LoadLibrary('libc.dylib') failed.
- Compatibility with the latest prompt_toolkit.

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Fixes:
- Fixed FreeBSD support.
- Compatibility with the latest Pyte version.
- Handle 'No such process' in os.kill.

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Fixes:
- Fix module import of pyte==0.5.1
- Use gettempdir() for sockets.
- Disable bracketed paste when leaving client.
- Keep dimensions when closing a pane.

New features:
- Display the process name on Mac OS X.
- Exit scroll buffer when pressing enter.
- Added synchronize-panes window option.