Added missing types supported by Sybase to ischema_names mapping
Created a SybaseInspector similar to the PGInspector, with a cached table_id lookup, and added it to the SybaseDialect as the default inspector.
Added the following methods to SybaseDialect: get_table_id get_columns _get_column_info : support method for get_columns get_foreign_keys get_indexes get_pk_constraint get_schema_names get_view_definition get_view_names Rewrote the following methods to conform to the style of the rest: get_table_names has_table
Reordered colspec builder to put default clause after "NULL/NOT NULL", instead of before. This fixed a syntax error.