Fixed CI build

1.1.1

Updated DX docs and fixed CI config

Updated schema generator and build process

Feature/fix schema generator for ranges (#7)

* Created new RangeSchemaProvider that deals with Infinity values consistent with JSON schema spec
* Moved classes into their own files

* Usings cleanup

* Ignored Visual Studio directory

* Fixed build script by pinning Cake versions

* Updated schema generator to .NET Core 2.0 and simplified build steps