small typo fix

renamed getNumVertives to getNumVertices.
Merge pull request #378 from MGinshe/patch-1

small typo fix
refactoring: remove not use iosystem.

Signed-off-by: Kim Kulling <kim.kulling@googlemail.com>
update: avoid mesh generation on heap, when the mesh will be empty ( obj-loader ).

Signed-off-by: Kim Kulling <kim.kulling@googlemail.com>
Merge remote-tracking branch 'upstream/master'