AIM360/assimp — pull request #7 by zhgw01 (2013-11-29 05:38:19+00:00)
Title: Fix obj texture parsing error when it contains texture option

Skip texture option to get texture image url correctly.
According to http://en.wikipedia.org/wiki/Wavefront_.obj_file#Texture_options, Texture map statement can contains various texture option, for example:

map_Ka -o 1 1 1 some.png

map_Kd -clamp on some.png

So we need to skip this option, just keep the last part which is the url of image, otherwise we will get a wrong url like "-clamp on some.png". Here we also take a special case into account where url contains space:

map_Kd -clamp on "url contains space.png"
Add Clamp option support for obj texture mode.
If "-clamp on" is detected, we will set the texture mode to clamp.