Add PostgreSQL support
Add PostgreSQL support

- Supports selection-based and file-based invocation of PostgreSQL's interactive command line `psql'

- Connects as user $PGUSER to database $PGDATABASE.

Both default to the operating system's user name and both can be set in the process environment, e.g. in Atom's init.coffee script:

    process.env.PGUSER = ⟨username⟩
    process.env.PGDATABASE = ⟨database name⟩

rgbkrk/atom-script,fscherwi/atom-script,idleberg/atom-script