Support DELTE IF

See #13

• runtime: allow use If in query builder after Where to filter on normal columns
• generator: add Eq to all columns so they can be used after If as condition

Cassandra 3 Fix

There are two mappings literalTypes and columnTypes, I only updated one in previous release, realized it after start using it 😅

Cassandra 3

Fixed #7, just need a new literal type for working w/ C*3

• remove logrus from dependency
• init go mod support

Reboot

Mainly in #4

• the generator now compiles
• support update map value by key, previously only full map update is supported
• use logrus and pkg/errors
• e2e test using docker instead of ccm