Added a ToString for ranges.
Added DateTimeOffset accessors to ITimeSource.
Added a RemoveFirst helper method for lists.
Added a Separator IEnumerable extension with behavior like string.Join.
Added a method to convert an int range to an IEnumerable<int>.
Added a helper method to create a double equality comparer with a given precision.
Revert "Added DateTimeOffset accessors to ITimeSource."

This reverts commit c16f8a6217962b1ca237b13dc218d8fee12c54bb.
Merge branch 'feature/linq' into develop
Added a FakeTimeSource implementation for testing.
Version 1.7.0.