separate typeinfo and testclass interfaces to avoid hack

add a little wait to the tests so that parallel behavior can be better observed

add strong key for test to see assembly loading errors

Make parallel execution configurable (fix parallel issue with "Fix serialization error for signed test assemblies")

Fix serialization error for signed test assemblies

Update README

Fix for #16: Source controller marked class files throw System.UnauthorizedAccessException during SourceMap

upgrade xUnit in sample project

Upgrade sample project to SpecFlow 2.3.1 and SpecFlow.xUnitAdapter 1.2

fix NuGet package dependencies

Update NuGet.CommandLine

Upgrade to SpecFlow 2.3.1

upgrade to xunit 2.3

Make explicit its requirements (#17)

Rename sample solution