Added TestFixture attribute where missing, added default section
(string.empty) reading
Ensure commented lines are ignored
Added more specification on multiple occurency of sections or settings
Improve test naming
Renamed GetValue to just Get
Removed depency to NSubstitute in tests, not needed
Make sure casing is ignored on multiple occurencies of a property/setting.
Cleanup namespaces in test
Cleanup unused namespace
Some cleanups, removal of section pattern unittest, they where already
covered by an integrationtest