Issue #12 - Added scanner support

- Create a scanner
 - Filter support: ColumnPrefixFilter, ColumnRangeFilter,
   FamilyFilter, QualifierFilter, RowFilter, FirstKeyOnlyFilter,
   InclusiveStopFilter, MultipleColumnPrefixFilter, PageFilter,
   PrefixFilter, SingleColumnValueFilter, TimestampsFilter,
   FilterList
- Read a result from a scanner
 - Manual
 - Via disposable/enumerable object
- Delete a scanner
 - Manual
 - Via disposable/enumerable object