Added issue numbers for most core TODOs
Mary didn't have a little lambda...

Non-generic and string-based overloads for the relationship APIs
WithRequiredDepenipal...

Required fluent API on relationship builders.
Magically not-vanishing angle brackets...

Add "new" methods to generic OneToMany and ManyToOne builders so that the returned builder for chaining is still generic.
Faceted up to the max...

Introduce first-class MaxLength fluent API as per design meeting notes: https://github.com/aspnet/EntityFramework/wiki/Entity-Framework-Design-Meeting-Notes-June-5,-2014#fluent-api
Reacting to Roslyn changes
Update Ix-Async pacakge