Added <e@entity.spawn_reason>

Returns a SpawnReason, if none exists, returns null
Added <entity[<eid>]....> to EntityTags
Small fix to previous commit
Fix git derp, and remove tag conflict
Merge branch 'master' of https://github.com/aufdemrand/Denizen
Add flag event meta
Merge pull request #670 from Jeebiss/master

Added <e@entity.spawn_reason>