Inconsistent argument names

[vpietilainen]

Argument names seem inconsistent. In athena.read_sql_query we have arguments database and ctas_database_name, whereas in athena.create_ctas_table we have database and ctas_database. It seems that _name suffix would not be necessary.

In addition it would be nice if ctas_database could be read from environmental variables.

[jaidisido]

Appreciate that the names are inconsistent across the methods, however changing them would be a breaking change for users. We might want to consider it in our next major version (3.0).