Merge pull request #4 from abiskop/master

added splash_pic and highres_pic_url to mapping and validation
add start script
add s3store-mock for testing deployment
add docker
update config
use s3store in start script
update configuration
add logging
updated s3store
removed pic_metadata_url altogether (obsolete); coupon_code non-mandatory in online_coupon
set response charset to utf-8
updated s3store
change module interface, add mock tests
change name, v0.0.2
add duplicate mock offer
store plugin conf'able via env var