Remove pre-1.0 CZML backwards compatibility code.

1. Remove necessary conjugation of quaternion values
2. Remove negating of y value in pixelOffset
3. Remove `image` as a valid way to specify a uri (only `uri` is valid).
4. Regenerate sample CZML data.

Note: This pull does not include CZML versioning, which will happen soon in a different pull.  CHANGES hasn't been updated yet because there is going to be a single big explanation written involving all CZML changes when we get close to 1.0 release.