Make compatible with https://github.com/Enelar/pgsql_php

To get same functionality:

```
include_once('phpsql/phpsql.php');
include_once('phpsql/pgsql.php');
$sql = new phpsql();
$pg = $sql->Connect("pgsql://user:pass@host:posrt/db");

include_once('phpsql/db.php');
db::Bind($pg);
```

After that every
`db::%FUNC_CALL(...)` redirecting to `phpsql\proxy`