OpenGL warnings

Some bugs with Unbuntu after installation.

Seems like another Electron bug.

https://github.com/Jam3/devtool/issues/2#issuecomment-173252481

```
Some error after simple installation on Ubuntu (With VirtualBox)
$ devtool
pci id for fd 15: 80ee:beef, driver (null)
OpenGL Warning: glFlushVertexArrayRangeNV not found in mesa table
OpenGL Warning: glVertexArrayRangeNV not found in mesa table
OpenGL Warning: glCombinerInputNV not found in mesa table
OpenGL Warning: glCombinerOutputNV not found in mesa table
OpenGL Warning: glCombinerParameterfNV not found in mesa table
OpenGL Warning: glCombinerParameterfvNV not found in mesa table
OpenGL Warning: glCombinerParameteriNV not found in mesa table
OpenGL Warning: glCombinerParameterivNV not found in mesa table
OpenGL Warning: glFinalCombinerInputNV not found in mesa table
OpenGL Warning: glGetCombinerInputParameterfvNV not found in mesa table
OpenGL Warning: glGetCombinerInputParameterivNV not found in mesa table
OpenGL Warning: glGetCombinerOutputParameterfvNV not found in mesa table
OpenGL Warning: glGetCombinerOutputParameterivNV not found in mesa table
OpenGL Warning: glGetFinalCombinerInputParameterfvNV not found in mesa table
OpenGL Warning: glGetFinalCombinerInputParameterivNV not found in mesa table
OpenGL Warning: glDeleteFencesNV not found in mesa table
OpenGL Warning: glFinishFenceNV not found in mesa table
OpenGL Warning: glGenFencesNV not found in mesa table
OpenGL Warning: glGetFenceivNV not found in mesa table
OpenGL Warning: glIsFenceNV not found in mesa table
OpenGL Warning: glSetFenceNV not found in mesa table
OpenGL Warning: glTestFenceNV not found in mesa table
libGL error: core dri or dri2 extension not found
libGL error: failed to load driver: vboxvideo
[8871:0120/170708:ERROR:buffer_manager.cc(342)] [GroupMarkerNotSet(crbug.com/242999)!:D06E021D8F330000]GL ERROR :GL_INVALID_ENUM : glBufferData: <- error from previous GL command
[8871:0120/170709:ERROR:texture_manager.cc(1995)] [GroupMarkerNotSet(crbug.com/242999)!:D062021D8F330000]GL ERROR :GL_INVALID_ENUM : glTexImage2D: <- error from previous GL command
```