add original dataset normalization
Added the normalization
Added reading parent key and col from metadata
Added DBDenormalizer
Modified the mysqlconvert, Added the Decimal type support
Added combining insert operations
Changed the sqlparse lib to version 0.1.11
Fixed the converting update sql that cannot handle increase and mul situations and Fixed the format
Added changing isolated inserts into updates
Added combining QUERY, DELETE and UPDATE
when the collection is unsharded, all queries should be routed to the primary node
merge with ruizhang's work