Added information about refreshing Impala's cached metadata information to the demo readme.
Show java compiler warnings.
CDK-154. CDK should not have a compile dependency on slf4j-log4j12
Updating dataset example for URI repo instantiation.
Updating dataset example to use schemaUri(resource:)

This removes the need for users to use Resources.getResource and parse
the URL returned themselves.
Updating dataset-staging for 0.8.0 release.
Updating logging-webapp example for 0.8.0.

Updated repository instantiation to URI-based and removed FS-specific
call to getMetadataProvider. It now calls
repo.load(name).getDescriptor().getSchema()
Updating logging example for 0.8.0.

Same changes as logging-webapp: use URIs and don't call
repo.getMetadataProvider.
Updating demo example for 0.8.0.

Just needed to change repo instantiation to URI-based.