beta 1 (vapor#71)

* beta 1

* use gh actions for ci

* fix sql kit spelling in ci manifest

sql joins list fix

add default literal option to SQLDialect

implement model func

custom datatype (vapor#60)

alpha (vapor#59)

* update circle + add swiftpm ignore

* remove collate + rename to execute(sql:)

* update readme

* bump

sort insert rows

swift 5 warning fix (vapor#55)

* swift 5 warning fix

* fix test deps

Add support for NULL/NOT NULL-based sorting (vapor#49)

Merge pull request vapor#43 from rausnitz/coalesce

Coalesce