Remove async and await keywords
Merge branch 'master' of github.com:NIPOSoftware/Test

Conflicts:
	Tests/Services/NfieldInterviewersServiceTests.cs
Remove all async and await keywords and remove corresponding packages.
Merge branch 'master' of github.com:NIPOSoftware/Test

Conflicts:
	Examples/NfieldInterviewersManagement.cs
	Examples/Program.cs
	Library/Extensions/NfieldInterviewersServiceExtensions.cs
	Library/Infrastructure/NfieldConnection.cs
	Library/Services/Implementation/NfieldInterviewersService.cs
	Tests/Services/NfieldInterviewersServiceTests.cs
Repeat changes because of merge.