project_build script - i flag is deprecated. Remove it.

```
dumping: pg_dump -F c -i -U postgres -h postgres -f /home/intermine/intermine/dump/dump.final humanmine
 pg_dump: unrecognized option: i
```
This does not result into an error.. but still

https://www.postgresql.org/docs/9.4/app-pgdump.html

```
-i
--ignore-version
    A deprecated option that is now ignored.

```