Test adding multiple items to a ReactiveCollection that is converted to an ObervableCollection.
Add Copyright notices, remove unused using directives, changes settings for Code Contracts checking.
Remove useless cast.
Add explicit interface implementations to work around a Code Contracts warning.
Fix StylCop suggestions!
Fixed all ReSharper and StyleCop suggestions, reimplemented a unit test.
Added Code Contracts to DictionaryReactiveCollectionSource.
Qualify a reference with "this".
Added lots of Code Contracts Requires and Ensures!