feature [http\Request] add __construct() params to manually initialize Request, useful for testing
feature [db\orm\Repository] add FETCH_* mode to INSERT and UPDATE, clean QueryRunner, fix trace messages
feature [db\orm\Repository] add FETCH_* mode to DELETE
bug [db\orm\util\DataMapper] fix array2object() when forcing NULL values on empty strings
test [db] new tests on NULL values
Merge branch 'develop'