fixes #81 - adds return code to Sculptor code generator to indicate success or failure, deletes generated files on failure and removed trace logging
#81 - removes trace logging
fixes #72 - adds missing mongoDB samples (blog and library) and clean-up in existing mongoDB samples
#77 - accesses system property direct instead of using Guava (now older Guava version can be used again)
#74 - updates version of the Spring Framework to latest one
applies a few cosmetic changes in mongoDB templates  and removes obsolete logging