- aspnet/Coherence-Signed#187
- remove `<RootNamespace>` settings but maintain other unique aspects e.g. `<DnxInvisibleContent ... />`
- in a few cases, standardize on VS version `14.0` and not something more specific
Also correct tests to avoid warnings and to ensure scenarios are actually tested
- tests previously went `async` without waiting for completion
nit: add parameter `null` checks