(1)
Script Animation has the same name as build-in Unity component.
AddComponent and GetComponent will not work with this script.
This is a nonsense warning message. Spine.Animation is not a Component. Nothing to worry about.
(2)
UnityEngine.Rigidbody2D.fixedAngle is obsolete`
That's nothing to worry about. It's just one of the old examples (which Mitch made compatible with Unity 4.6).
The code that uses the obsolete API still works.
Unity 5 auto-updates it to the new API so just let it do that.
But ultimately this doesn't matter either, since it's just one of the examples. You can remove that and everything works fine.
