Allow a default value when the attribute is assigned as nil, with the :allow_nil option#292

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JanDintel wants to merge 3 commits intosolnic:masterfrom

JanDintel:allow-nil-option

Commits on Sep 3, 2014

Add the :allow_nil option, which is true by default, and its #allow_nil? predicate on the Virtus::Attribute class
JanDintel
committed
Add the Virtus::Attribute::Accessor#present? predicate, to determine the presence of the attribute on the Virtus instance given the :allow_nil option
JanDintel
committed
Implement the feature of allowing a default value when the attribute is assigned as nil:
JanDintel
committed