Added intsuffix

[ZuluPro]

Added intsuffix to humanize into just the symbol k, M, G, P, T, etc

[hugovk]

Thanks for the PR! Please also add it to __all__ in https://github.com/python-humanize/humanize/blob/master/src/humanize/__init__.py, that should fix the tests.

[codecov-commenter]

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[hugovk]

Thinking about the name intsuffix: what we're doing here is taking a large integer, and finding a good "unit prefix" to go with it.

Would intprefix be a better name?

[hugovk]

Closing in favour of #22 which should more-or-less cover this too. Thanks!