Apply splat to schema sets and path aliases without explicit select.

[dnwpark]

close #838

Ensures a splat is applied in the following cases:

default.User
default.User.filter(...)
default.User.groups
default.User.groups.filter(...)
default.User.filter(...).groups
default.User.filter(...).groups.filter(...)

Also ensures that splats are applied if such a case is used within another object's select.

default.Group.select(
    users=default.Post.author  # splat applied here
)

[msullivan]

I would try to merge these cases, instead of duplicating the bodies?