cinder/Cinder — pull request #557 by thyrrestrup (2014-10-31 16:21:48+00:00)
Title: Changed ci::ObjLoader to enable loading of groups from .obj files.

This is somewhat of a quick fix in response to #553 but it enables the following use case:
```
map mGroups;

ObjLoader loader( loadAsset( "model.obj") );
int index = 0;
for( auto group : loader.getGroups() ) {
loader.load( index++ );
mGroups.insert( pair(group.mName, gl::Batch::create( loader, gl::getStockShader( gl::ShaderDef().color() ) ) ) );
}

mGroups["groupName"]->draw();
```
For the general case of loading the full obj the following must be called:
```
loader.load();
```
Before creating the Batch:
```
gl::Batch::create( loader, gl::getStockShader( gl::ShaderDef().color() ) )
```
Therefore the ObjLoader sample must also be updated.