Add collisions to meshes in Gazebo8

[Agustin Alba Chicar]

Need to do the following:

• Create a mesh from code.
• Add collisions to that meshes.

[Agustin Alba Chicar]

Added a material to the mesh. refs #162

→ <<cset 7cd5a1bc960c>>

[Agustin Alba Chicar]

Got the following error when loading a mesh generated from code:

[Err] [Visual.cc:2286] Visual::InsertMesh no submeshes, this is an invalid mesh
[Err] [Visual.cc:373] Ogre Error:OGRE EXCEPTION(2:InvalidParametersException): Header chunk didn't match either endian: Corrupted stream? in Serializer::determineEndianness at /build/ogre-1.9-mqY1wq/ogre-1.9-1.9.0+dfsg1/OgreMain/src/OgreSerializer.cpp (line 89)
[Err] [Visual.cc:374] Unable to create a mesh from /tmp/mesh/meshes/mesh.dae

Asked to OSRF about it to get some hints on the possible origin.

[Agustin Alba Chicar]

The previous part was solved after making a proper mesh based on gazebo::common::MeshManager .

[Agustin Alba Chicar]

See issue #164 --> we are using a fixed texture for all the roads.

[Agustin Alba Chicar]

Creating meshes to the road. refs #162

→ <<cset 2cd874264a55>>

[Agustin Alba Chicar]

Working meshes for zones and for junctions. refs #162

→ <<cset 10851d1cb52b>>

[Agustin Alba Chicar]

Added comments regarding issue #164. Commented code for materials. refs #162

→ <<cset cd788c101899>>

[Agustin Alba Chicar]

Closed via PR #60