Added name member to Collada::Mesh.
Added parsing of Collada mesh names.
Added loading of mesh name from Collada mesh to aiMesh struct.
Collada mesh name is copied from id only if there was no name attribute in the <geometry> node.
Merge branch 'master' of https://github.com/assimp/assimp
Merge pull request #78 from sherief/master

Fix for Collada mesh naming bug