Support numeric default value both 9.4 and 9.5+, fix testcase

slick-testkit/src/codegen/resources/dbs/postgres.sql

@@ -49,5 +49,8 @@ CREATE TABLE "test" ("smallint_auto_inc" SMALLSERIAL,
                       "numeric_default_neg" NUMERIC DEFAULT -1.1,
                       "char_dafault" CHAR(5) DEFAULT 'abcde',
                       "varchar_default" VARCHAR DEFAULT 'abcde',
                       "text_default" TEXT DEFAULT 'abcde'
                       "text_default" TEXT DEFAULT 'abcde',
                       "char_default_empty" char(1) NOT NULL DEFAULT '',
                       "char_default_valid" char(1) NOT NULL DEFAULT 'a',
                       "char_default_invalid" char(1) NOT NULL DEFAULT 'ab'
                      );

slick/src/main/scala/slick/jdbc/PostgresProfile.scala

@@ -63,7 +63,7 @@ trait PostgresProfile extends JdbcProfile {
      override def schema = super.schema.filter(_ != "public") // remove default schema
    }
    override def createColumnBuilder(tableBuilder: TableBuilder, meta: MColumn): ColumnBuilder = new ColumnBuilder(tableBuilder, meta) {
      val NumericPattern = "^'(-?[0-9]+.?[0-9]*)'::(?:numeric|bigint|integer)".r
      val NumericPattern = "^['(]?(-?[0-9]+\\.?[0-9]*)[')]?(?:::(?:numeric|bigint|integer))?".r
      val TextPattern = "^'(.*)'::(?:bpchar|character varying|text)".r
      val UUIDPattern = "^'(.*)'::uuid".r
      override def default = meta.columnDef.map((_,tpe)).collect{