Replace some shop icons with SVGs

Icons have been designed keeping in mind the pixel grid, improving sharpness.

New|Old
![New convenience](https://cloud.githubusercontent.com/assets/1190866/3352372/160b8932-fa43-11e3-96a9-05e61a41daf2.png)![Old convenience](https://cloud.githubusercontent.com/assets/1190866/3352375/267d8f54-fa43-11e3-98bb-c7bc9955d02b.png)
![New Car](https://cloud.githubusercontent.com/assets/1190866/3352377/554f8efe-fa43-11e3-9f2e-25bebb572d88.png)![Old Car](https://cloud.githubusercontent.com/assets/1190866/3352376/3c84b30e-fa43-11e3-99e7-9eeebdfb92d6.png)
![New supermarket](https://cloud.githubusercontent.com/assets/1190866/3352381/7f2e4ef4-fa43-11e3-8b6b-8721f8f0de1b.png)![Old supermarket](https://cloud.githubusercontent.com/assets/1190866/3352385/9746af36-fa43-11e3-9eee-6b696d3883a7.png)
![New clothes](https://cloud.githubusercontent.com/assets/1190866/3352391/d887fab8-fa43-11e3-929d-2ff01c30f7a6.png)![Old clothes](https://cloud.githubusercontent.com/assets/1190866/3352389/c092787a-fa43-11e3-8436-a52173ed3d1c.png)