Introduced a NullLoggerFactory which aligns more cleanly with the dependency requirements of the components

Declared content length for checksums to avoid chunked transfer encoding which is troublesome with nginx (HTTP 411)

Simplified VersionConstraint.getRanges() to getRange(), an aggregation of ranges is again a range and the semantics of the aggregation are an impl detail

Made DefaultServiceLocator automatically register Slf4jLoggerFactory if slf4j-api is found on the classpath

Improved support for named loggers by introducing a LoggerFactory component that the other components can use

Fixed tests to user proper file->URL conversion to handle paths with spaces (and other illegal URL chars)

Added execution of maven-enforcer-plugin and its bannedDependencies rule to check our set of transitive dependencies against the whitelist of dependencies approved via CQs

Fixed dependency on slf4j-api to use proper version 1.6.2 as requested via CQ #5627

Added TransferEvent.RequestType.GET_EXISTENCE to allow transfer listeners to distinguish GET and HEAD requests, e.g. to provide better log messages

support modules url inheritance

Moved contents of aether-test-util module into internal package, this is no API stuff, at least not yet