Add SoftDelete Trait support

[munizeverton]

Adds the SoftDelete trait if deleted_at field exists in the table

closes #40

[cacpmw]

@krlove please take a look at this PRs

[phpguru]

Seems pretty legit to me, I'd use it.

[CyberSharkyMS]

I'm suggesting for this code to be reviewed following the latest version of Eloquent Model Generator and hope this can be merged in future updates.

[use]

[function process()]

[function getPriority()]

[Result - Generated Model]