Fixed service locator to properly handle case where both classes and instances are registered for a given service

Used UTC for timestamp in OSGi version qualifier (generally reasonable and aligns bundle versions with feature versions generated by Tycho's .qualifier expansion)

Tweaked bundle version for snapshots to include timestamp such that OSGi can distinguish one snapshot from another

Enforced use of OSGi-friendly versioning schema to ensure milestone < rc < final release is valid in both Maven and OSGi worlds

Added OSGi/Eclipse headers to manifest of source JARs in preparation for assembly of source feature using Tycho

Included path to troublesome dependency in exception message

Introduced configuration property aether.dependencyCollector.maxExceptions

Shortened property names to tweak DefaultOfflineController to aether.offline.*

Added missing JSR-330 constructor for DefaultOfflineController and fixed typo in argument list to exception

Introduced component OfflineController whose default implementation allows access to remote repos with certain protocols or hosts even in offline mode

Added new RepositoryOfflineException

Bug 391291 - Allow for querying version range details in interface 'org.eclipse.aether.version.VersionRange'

Introduced VersionRange.getLowerBound() and VersionRange.getUpperBound()

Bug 391102 - ArtifactResolutionException (and others RepositoryExceptions) are not actually serializable

Excluded fields with extended runtime information from serialization of exceptions

Moved update policy interpretation from UpdateCheckManager into dedicated UpdatePolicyAnalyzer component to ease maintenance and customization

* Was using platform encoding to write out the checksum files. The checksums should always be
  a subset of US-ASCII, so forcing encoding to US-ASCII.

* Class is final anyway, and the reference to TransferEventCatapult.this is never used.