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[RUBY-33] remove unnecesary cql-rb bits from the codebase
use rubinius 2.2.10
[RUBY-51] clear current keyspaces of all sessions when dropped
update Ione to 1.2 stable
[docs] add mapping for list, map and set datatypes
switch to assertions instead of conditional checks
fix integration test
remove param metadata stubs
Merge pull request #42 from datastax/assert-parameter-types

[RUBY-56] Assert parameter types
[RUBY-57] remove string interpolation of positional args for protocol v1
fix spec
Merge pull request #43 from datastax/remove-cql-string-interpolation

[RUBY-57] remove string interpolation of positional args for protocol v1
[RUBY-59] add Cassandra.cluster_async
fix error messages
[ci skip] update docs
overload #inspect for keyspace, table and column
[ci skip] document positional arguments minimum Cassandra version
Merge pull request #44 from datastax/cluster-async

[RUBY-59] add Cassandra.cluster_async
[ci skip] update CHANGELOG