add AI_CONFIG_IMPORT_COLLADA_IGNORE_UP_DIRECTION for not transforming position of vertices
Merge pull request #60 from YoheiKakiuchi/master

IGNORE_UP_DIRECTION for not transforming point of vertices
Merge pull request #62 from faulesocke/master

Fixed a bug returning not all material properties when accessing them.
Merge branch 'master' of github.com:assimp/assimp