2 minor changes.  First made the .gitignore file better for .net project (excluding auto generated files) and removed some unnecessary parathesis

HI Eric,

I'm submitting my first pull request (i.e my first contribution to an open-source project) ever.  I'm not sure I did everything right. The goal here would be to have a better .gitignore file.

In .NET, the obj and bin folder are auto generated by the compiler/IDE. Excluding them from source control is generally a good idea.

Hope it helps.

Thanks