Blog cover image is now properly stored on database.

Signed-off-by: Marcos Ramos <ms.ramos@outlook.com>
Signed-off-by: Fábio Teixeira <fabio1079@gmail.com>
Blog cover image fixes

Signed-off-by: Marcos Ramos <ms.ramos@outlook.com>
Signed-off-by: Fábio Teixeira <fabio1079@gmail.com>