Developer can invoke a rake task that renames schemas to implement suffix

[ramontayag]

It would be nice to have a built-in rake task to implement schema suffixes.

For example: I have a system that doesn't use suffixes, but I want to be able to duplicate schemas and be sure that Storey does not accidentally rename a text in the SQL file that doesn't actually refer to the schema name. I can then set Storey.suffix = '_nakam' and run rake storey:rename_schemas. This will rename all schemas except public.

Also add ability to change suffix even if you already have set one. For example, if I have schemas with the suffix '_nakam' and I want to make them '_pucha', then I can:

1. Change the Storey.suffix = '_pucha'
2. Run rake storey_rename_schemas PREV_SUFFIX=_nakam