Better wording

Signed-off-by: Stephen Celis <stephen@stephencelis.com>
Fix README SQL syntax error

Yet another case for the Query builder.

Signed-off-by: Stephen Celis <stephen@stephencelis.com>
Reorganize README

Features come first.

Signed-off-by: Stephen Celis <stephen@stephencelis.com>
Add SQLite.Values typealias

It represents a dictionary of values, you know, `[String: Datatype?]`.

Handy for preparing inserts, updates and the like:

    let alice: Values = ["email": "alice@example.com"]
    users.insert(alice)

Signed-off-by: Stephen Celis <stephen@stephencelis.com>