Static sql

Add static sql type mapping support

How to use it?

Declare your custmization postgres driver as below:
```scala
import slick.driver.PostgresDriver
import com.github.tminglei.slickpg._

trait MyPostgresDriver extends PostgresDriver
                          with PgArraySupport
                          with PgDateSupportJoda
                          with PgRangeSupport
                          with PgHStoreSupport
                          with PgPlayJsonSupport
                          with PgPostGISSupport {

  override lazy val Implicit = new ImplicitsPlus {}
  override val simple = new SimpleQLPlus {}

  //////
  trait ImplicitsPlus extends Implicits
                        with SimpleArrayPlainImplicits
                        with JodaDateTimePlainImplicits
                        with SimpleRangePlainImplicits
                        with SimpleHStorePlainImplicits
                        with PlayJsonPlainImplicits
                        with PostGISPlainImplicits

  trait SimpleQLPlus extends SimpleQL with ImplicitsPlus
}

object MyPostgresDriver extends MyPostgresDriver
```

Then add `import MyPostgresDriver.simple._` to your classes and use it.