Update PostgreSqlPlatform.php

If the database have different schemes, with objects, that the actual logged in user has no rights, the existing statements will collect all objects (sequences and tables) and try to read them in later steps. This will throws exceptions. The reason for that is the fact, that both procedures getListSequencesList() and getListTablesSQL() will receive all known database objects from postgres catalogs. But the actual logged-in user, maby has no read permissions to object inside other scheme-owner. The additional parts inside both sql-statements will reduce the result to only objects that the user are able to see.
Update PostgreSqlPlatform.php

missing table identifier added
Update PostgreSqlPlatform.php

correct table identifier
Update PostgreSqlPlatform.php

I take the guess an use the information_schema. It makes it more clear and simple
Update PostgreSqlPlatform.php

some format changes to trigger travis-cl once more again
only introspect namespaces and views accessible
Merge pull request #702 from deeky666/DBAL-930

[DBAL 930] Only introspect accessible schema objects in PostgreSQL