Merge pull request #162 from tangziwen/v3

use dummy texture even if in release mode
move aabb calculation to bundle
fix bug: read animation number by different version.
Merge pull request #163 from lvlonggame/v3

fix bug: read animation number by different version.
fix bug: if the material's content  that version 0.1 is empty.
Merge pull request #168 from lvlonggame/v3

fix bug: if the material's content  that version 0.1 is empty.
avoid the case that "hasAmbient" use before assign