Added examples project

Moved GoxSharp files to their own project directory and added secondary
project for examples. Solution file now created to manage both projects.
Fixed .gitignore and project reference paths

Dependency DLLs are now checked into repo. The project reference paths
are now local and point to those DLLs. The .gitignore has been updated
to account for the new directory structure.
Added default NEEDTOCONFIG values to appsettings

Fixed null reference exception getting generated when it couldn't read
any value for api key/secret. Now the default is NEEDTOCONFIG.
Merge branch 'master' of https://github.com/Retik/GoxSharp

Conflicts:
	GoxSharp/MtGoxRestClient.cs
	MtGoxWebSocket.cs