Add days_in_year method to Time class

[pacso]

Adds a days_in_year method to the Time class.

Returns 365 for common years and 366 for leap years.

[rails-bot]

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[pixeltrix]

@pacso can you add a CHANGELOG entry please - thanks

[pacso]

@pixeltrix - Have added an entry to the activesupport CHANGELOG now.

Cheers,
Jon

[pixeltrix]

@pacso sorry to be a pain, but could you please squash them into a single commit - thanks

[pacso]

@pixeltrix no problem at all. Should already be done.

[pixeltrix]

@pacso thanks for your contribution!