Croniter

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- Added "implement_cron_bug" flag to make the cron parser compatible with a bug in Vixie/ISC Cron
[kiorky, David White <dwhite2cisco.com>]
*WARNING*: EXPAND METHOD CHANGES RETURN VALUE

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- Fix hashed expressions omitting some entries
[waltervos/Walter Vos <walter.vosns.nl>]
- Enhance .match() precision for 6 position expressions
[szpol/szymon <szymon.polinkiewiczgmail.com>]

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- Lint

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- Add check for range begin/end

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- restore py2 compat

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- Do not expose `i` into global namespace