Update getEntityByProp to return an Array of Entity instead of the first Entity found
Fix return's object to be like function getEntityByName
Fulfill the side-request from @parasyte to make collidable object by default
Avoid override value
Merge pull request #186 from DblK/getEntityByProp

Update getEntityByProp to return an Array of Entity
Merge pull request #188 from DblK/collidable

Set default collidable property to true for ObjectEntity
Make me.DefaultLoadingScreen idempotent.

- Using the loading screen more than once would cause an exception, since the font gets destroyed when loading completes the first time.