- update license header. Update copyright year and unify naming: our name is 'assimp', not 'ASSIMP'.

- update license header. Update copyright year and unify naming: our name is 'assimp', not 'ASSIMP'.

git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@1147 67173fc5-114c-0410-ac8e-9d2fd5bffc1f