fix table creation for postgresql

[comboy]

with definition

property :id, Serial

it was generating query like:

CREATE TABLE "foobars" ( SERIAL PRIMARY KEY, ... ,  PRIMARY KEY("id"))

while proper one should be:

CREATE TABLE "foobars" ( "id" SERIAL PRIMARY KEY, ... )

This fixes the issue.

[xaviershay]

yes! Thank you this has been biting me. I'll look into the testing issue ... pretty sure I had them working. Try running them with bundle exec spec rather than rake maybe?

[xaviershay]

This appears to be already working on master using a different method, and I can't get a failing test. Please reopen if you can. /cc @ben_h