Merge pull request #253 from cendter/master

fixes https://github.com/thinktecture/Thinktecture.IdentityServer.v3/issues/252
Added check that authZ code has associated scopes
Added basic refresh token unit tests
rename client and scope services to stores
Merge branch 'master' of https://github.com/thinktecture/Thinktecture.IdentityServer.v3

Conflicts:
	source/Tests/UnitTests/Connect/Validation/TokenRequest Validation/TokenRequestValidation_Code_Invalid.cs
Added refresh token validation unit tests
updated unit tests todo
Moved IViewService to services folder/namespace
RasU
Changed plugin configuration name
Update README.md
Update README.md
Update README.md
Update README.md
OrdinalIgnoreCase for origin and URL comparisons
add sliding expiration to cookie options
Allows duplicate claim types on userinfo response
sliding expiration defaults to false
Merge branch 'master' of https://github.com/thinktecture/Thinktecture.IdentityServer.v3
rework how custom CSS is added to embedded assets to allow for more control