[ENH] Add --keep-going

[cblegare]

Fixes #108

Add --keep-going

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[choldgraf]

Looks good to me - thanks for this improvement

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[julian-poidevin]

@cblegare Thank for this patch, I'm trying to use the --keep-going argument but this is failing (I manually installed commit 6af4e40 version) . Am I using it wrongly or is this a bug (in which case I'll open an issue).

Here's my command :

sphinx-autobuild --open-browser "source" "build" -D version=1.3 -D release=1.3.0 -W --keep-going

Here's the error :

Traceback (most recent call last):
  File "/workspaces/comboard-linux-image/docs/.venv/bin/sphinx-autobuild", line 8, in <module>
    sys.exit(main())
  File "/workspaces/comboard-linux-image/docs/.venv/src/sphinx-autobuild/src/sphinx_autobuild/cli.py", line 174, in main
    build_args, pre_build_commands = _get_build_args(args)
  File "/workspaces/comboard-linux-image/docs/.venv/src/sphinx-autobuild/src/sphinx_autobuild/cli.py", line 21, in _get_build_args
    val = getattr(args, arg)
AttributeError: 'Namespace' object has no attribute '-keep-going'
make: *** [Makefile:58: livehtml] Error 1