Iterm2-tools

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- Fix file name and size info for the image display.
- API break: the file name format string in `IMAGE_CODE` is now `{name}` (was
previously `{file}`.
- Flush stdout in before_output and before_prompt. This fixes the command
timing feature in the IPython integration.
- NOTE: The IPython shell integration in this version (and previous versions)
does not work with IPython 5.0.

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- Rename image_bytes to display_image_bytes (image_bytes has been kept for
backwards compatibility for now).
- Add readline_invisible() to shell_integration.
- Add iterm2_tools.ipython IPython extension to enable shell integration in
IPython.
- Enable Travis CI tests.
- Add Sphinx documentation hosted at https://iterm2-tools.readthedocs.org/.

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- Add context managers to shell_integration.
- Add an example REPL showing how to use the shell integration.

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- Add iterm2_tools.shell_integration, with some functions for working with
iTerm2's shell integration.

Breaking changes:

- Remove iterm2_ from iterm2_tools.images function names.

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- First release
- Add iterm2_tools.images with tools for displaying images in iTerm2. Copied
from catimg.iterm2.