Added default array for image driver configs

Signed-off-by: Derek Myers <arcticpro@gmail.com>
Moved loading config in image class and image driver to new init functions

Signed-off-by: Derek Myers <arcticpro@gmail.com>
Merge pull request #1386 from dmyers/feature/image-config-init

Moved load config in image to inti functions
Merge pull request #1387 from dmyers/bugfix/image-driver

Added default array for image driver configs
Just to be consistent :)
Merge pull request #1388 from huglester/patch-2

Just to be consistent :)
Changed filename to be optional when saving image and use current loaded image filename

Signed-off-by: Derek Myers <arcticpro@gmail.com>
Merge pull request #1385 from dmyers/feature/image-save

Changed filename to be optional when saving image