CDK-199: Fixing PathConversion format widths.

The last commit defaulted all format widths to 2, but this caused tests
that used an identity or hash partitioner to fail. Now widths are looked
up in a hash by partitioner class.
CDK-204: Change Builder#get to Builder#build (core).

This commit deprecates the Builder#get method and adds Builder#build for
DatasetDescriptor and PartitionStrategy. Marker's Builder renames get to
build because it is not in a released version of the API.

This commit also updates all calls to updated Builders in this
repository to use the build method.
CDK-204: Change Builder#get to Builder#build (fs).

FileSystemDatasetRepository and FileSystemMetadataProvider builders now
implement build and their get methods are deprecated. The
FileSystemDataset and FileSystemDatasetWriter builders are not public,
so build has replaced get.

Other references to FS builder get in this repo have been changed to
build and tests are passing.
CDK-204: Change Builder#get to Builder#build (hive).

HCatalogDatasetRepository's builder now implements build and get is
deprecated.
CDK-204: Change Builder#get to Builder#build (hbase).
Updating Marker documentation.