Ignored .tmp temporary artifacts from Nuke Build system

Fixed Nuke build script

Updated the project to .netcore. Introduced a build system based on Nuke Build

Merge pull request #10 from mtikilay/master

Upgraded to netstandard2.0 and SDK-style project.

Configured nuspec for automatic versioning in AppVeyor

Tested waitTime when ShouldThrottle returns true

Fixed assertion in one failing test.

Fixed wait time calculation in case that ShouldThrottle returns true

Some documentation rephrasing and method visibility correction.

New ratelimiter based on rolling window for controlling exactly the rate of some occurences in a time interval.

nuspec file for nuget.org deployment. Added in project directory

nuspec file for nuget.org deployment

Displaying build status from AppVeyor CI server

Enable package restore and nuget.exe download for build servers