Results 2 issues of sciencesakura

Adding the following 2 syntaxes. ``` 'foo' $$bar$$ ``` cf. https://cassandra.apache.org/doc/latest/cassandra/cql/definitions.html#constants

Adding CQL support. \(filetype is `cql` \) Ref. https://cassandra.apache.org/doc/latest/cassandra/cql/definitions.html#comments