avoid NPEs for missing checksums
new method to delete yumentries without gridfs files
Merge branch 'master' of https://github.com/ImmobilienScout24/yum-repo-server
add more connections for heavy usage
ensure metadata
optimze code
update mongo version to 2.4.8
add methods to delete corrupted data
add methods to delete corrupted data
replace deprecated methods
update to latest version
update to latest driver version 2.12.3
remove deprecated config option
update to spring 4.0.6
update to spring-data-mongo to latest version 1.5.2 and remove some deprecated calls
small code beautifier
simplify code
remove unused variable
test json represantation of FileStorageItem
simplify code