SCHEMA-884. AsyncKijiBufferedWriter#deleteFamily should use mTableName.

Changed AsyncKijiBufferedWriter#deleteFamily to use mTableName instead
of using mTable.getName(). Also added a test for deleteFamily.

issue: https://jira.kiji.org/browse/SCHEMA-884
SCHEMA-793. Implement AsyncKijiResult.
Implemented AsyncKijiResult, AsyncPagedKijiResult, AsyncMaterializedKijiResult,
AsyncKijiResultScanner, AsyncDataRequestAdapter, and associated tests.

issue: https://jira.kiji.org/browse/SCHEMA-793
Minor tweaks and updates to AsyncKijiResult