Add VB.net support

Restructured Folder Layout. 
Added VB.net support (VS2015)
Created merged VSIX
- This could benefit from addition information adding to it as I use the Author **DotNetAnalyzers**
this shouldn't be there. Artifacts folder name should be `artifacts` under solution root: https://gist.github.com/davidfowl/ed7564297c61fe9ab814. You can add that inside .gitignore instead.