Merge branch 'refactor/engine' into 'master'

src/adapter/postgres.ts

src/common/query.ts

src/common/types.ts

src/core/dimension.ts

src/core/engine.spec.ts

src/core/engine.ts

src/core/metric.ts

src/core/view.ts

src/util/hash.ts

tsconfig.json

tslint.json