This reverts commit 5a726a55.

This reverts commit 192bd52b.

regular setup/teardown always run, the lazy_setup/lazy_teardown
only run when actually used.
So now when running tests with '--tags=postgres' the (very slow)
Cassandra setup/teardown no longer run, speeding up overall tests.

Fix simple typos

add strategy for specs, to run tests against both databases

Fix rockspec filename inconsistency.

When running "luarocks make", luarocks was complaining about the rockspec filename being inconsistent with the contents.
This was happening because the rockspec file name should be all lowercase. This fix simply renames the file to lowercase in order for luarocks to work.
The package name can be kept as-is as for presentation purposes.