Fix deprecation warnings for getWriter, getReader.
Restoring c11067a and 99e3b37.

Updating dataset example for URI-based repository instantiation.
Updating to use resource: URI for schemas rather than Resources.
Restoring 57aa41c.

Updating to use URI-based repo instantiation and resource: URIs for
schema configuration.
Restoring 68fd17f.

68fd17f: 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()
Restoring 21e0321.

21e0321: Updating logging example for 0.8.0.

Same changes as logging-webapp: use URIs and don't call
repo.getMetadataProvider.
Restoring 9299777.

9299777: Updating demo example for 0.8.0.

Just needed to change repo instantiation to URI-based.
CDK-197: Update exmaples for parameterized Datasets.