(*) Update Readme
Merge remote-tracking branch 'github/master'
(*) Refactoring and cleanup.

- Changed IEnumerable<IEnumerable<T>> Sequences to IList<IEnumerable<T>>, which avoids some casting. All the tests still pass. If you need it to be IEnum<IEnum<>> then convert it back.
(*) Fixed GetConflicts() method
(+) Added GetConflicts() method tests
(+) Re-Added TestExtensions. I think they are needed to test edge cases.
Added files that were missed in previous commit