Git-edit-index

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* FIX: Fixed displaying of the index in editors that have problems when the
overall text does not end with a newline.

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* FIX: Fixed removal of files or directories when not being inside the
repository's root path. Previously, this failed with an exception.
* FIX: When an untracked directory is to be removed, use `shutil.rmtree()`
instead of `os.remove()` because `os.remove()` does not work on directories.

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* FEA: Allow staging, unstaging, and reverting changes of deleted files.
* FEA: Allow removing an untracked file by removing the corresponding line in
the editor.
* FEA: Allow setting the editor also by setting the `GIT_EDITOR` or `VISUAL`
environment variables.
* FEA: When the index is empty, do not show an empty editor.

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* FEA: Allow reverting changes done to a file since the last commit by removing
the line with the file from the editor.
* FIX: Use `--` before files when running Git commands to prevent confusion
when a file looks like a branch or tag.
* FIX: Added a missing description of the `?` status into README.
* FIX: Fall back to `$EDITOR` if Git's `core.editor` is not set.

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Initial release.