postgres: fix queries for prop create index, and for primary keys

[kapouer]

they were totally broken ;)

[dresende]

I'm going to move DML part to an external module. I've done it, just need a few more checks. Change can then be done there.

[kapouer]

Really ? i found node-orm2 more appealing precisely because it bundles the drivers,
so all drivers are supposed to be on-par quality-wise.

[dresende]

Sorry, I meant DDL (database synching). I'm doing the move now to https://github.com/dresende/node-sql-ddl-sync

[dresende]

The module is mine, so they will be kept on par. The difference is that in the module I and any contributors can focus on table synching (avoiding dropping table and recreating when a new property is needed).

[kapouer]

i understand, in fact i was afraid you were talking about splitting each database driver in its own module.

[dresende]

I just made the PR #383, will merge it now :)