Documentation for Properties
Add `:partition` option to Record::Schema#key
Use keyspace creation/destruction methods in spec helper
Raise RecordNotFound if multi-record load doesn't find all records
Add RecordSet#values_at method for IN queries

Too confusing to have so many different possible behaviors for the #[] method.
Partial documentation for RecordSet
Documentation for Record::Schema
Fix typo
Documentation for Record::Scoped
Documentation for SecondaryIndexes
Documentation for Record::SecondaryIndexes
Fix typo
Documentation for Record::Validations
Documentation for Cequel::Record itself