Yoyo-database-migrations

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* Fix for mismanaged 4.2.3 release

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* Migrations are now datestamped with a UTC date (thanks to robi wan)

* Fixes for installation and use under python 3

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* Migration scripts can start with ``from yoyo import step, transaction``.
This prevents linters (eg flake8) throwing errors over undefined names.

* Bugfix: functions declared in a migration file can access the script's global
namespace

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* Bugfix for previous release, which omitted critical files

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* Removed yoyo.migrate namespace package. Any code that uses the yoyo api
directly needs have any imports modified, eg this::

from yoyo.migrate import read_migrations
from yoyo.migrate.connections import connect

Should be changed to this::

from yoyo import read_migrations
from yoyo.connections import connect

* Migrated from darcs to mercurial. Code is now hosted at
https://bitbucket.org/ollyc/yoyo

* Bugfix: the migration_table option was not being passed to read_migrations,
causing the value to be ignored

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* Added windows support (thanks to Peter Shinners)