limit branches tested by travis-ci
remove Log class, partial migrate to slf4j
remove unnecessary casts and imports
[pom] extract dep mgmt and version variable for guice
remove unnecessary casts, dependencies
ProviderRuntime move to dbp-prv (the only use);
migrate some jul to slf4j;
minor fixes
Provider: remove dead unused methods
refactor: introduce sorcer-service-api, sorcer-container
refactor: introduce sorcer-service-api, sorcer-container
remove ILFactory from configs
method for extending Providers with MethodInterceptors, WiP
extract space taker to service processor, WiP, errors