Editing only the minute field of a published post then saving won't change the published time

[johnconners]

If you edit the hour, day, month or year of a published post and save then it'll be reflected in the published date but if you only edit the 'minute' field and save then the published date remains unchanged.

[markjaquith]

(In [7570]) Update timestamp when only the minute value is changed. props johnconners. fixes #6456 for trunk

[markjaquith]

(In [7571]) Update timestamp when only the minute value is changed. props johnconners. fixes #6456 for 2.5.1

[ryan]

(In [7609]) Update timestamp when only the minute value is changed. fixes #6456 for trunk

[ryan]

(In [7610]) Update timestamp when only the minute value is changed. fixes #6456 for 2.5

[ryan]

(In [7613]) Update timestamp when only the minute value is changed. fixes #6456 for 2.5

[ryan]

(In [7614]) Update timestamp when only the minute value is changed. fixes #6456 for trunk