Servicestack templates updated

- Upated Servicestack icon. 
- Added four V4 templates. 

### So, now there are 8 templates now .###
- V3 self host
- V3 asp.net host
- V3 self host with Razor view engine
- V3 asp.net host with Razor view engine
- V4 self host
- V4 asp.net host
- V4 self host with Razor view engine
- V4 asp.net host with Razor view engine

**Tested on VS2012 and VS2013**