Sweet Home 3D icons. #1052

Sweet Home 3D icons. Issue #1052 
- Main app:

![icons](https://cloud.githubusercontent.com/assets/8478202/5053281/0a6c8932-6c49-11e4-8e31-c03832aef454.png)

-Furniture Editor:

![icons](https://cloud.githubusercontent.com/assets/8478202/5053290/22c63550-6c49-11e4-9fc1-a487b75ba016.png) 

-Textures Editor:

![icons](https://cloud.githubusercontent.com/assets/8478202/5053300/38ef2238-6c49-11e4-8b3e-f5e01ed1adc8.png)