fixed retina support replacement regEx

Signed-off-by: Andreas Geibert <ageibert@cemico.de>
Initial draft of the readme file

Signed-off-by: Ralf Koller <r.koller@gmail.com>
Removal of empty lines

Signed-off-by: Ralf Koller <r.koller@gmail.com>
Merge branch 'master' of github.com:geibi/pictureserve