Add TimeZoneMixin#143

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LilyFirefly wants to merge 6 commits intomasterfrom

Commits on Oct 27, 2015

Add manage.py to allow creating test migrations
Ian Foote
committed
Add TimeZoneMixin with timezone field
Ian Foote
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Add TimeZoneMixin to changelog
Ian Foote
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Merge branch 'master' into timezone-field
Ian Foote
committed
Add timezone_choices helper function
Ian Foote
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Add choices to TimeZoneMixin.timezone field
Ian Foote
committed