tweaks to top-level readme
tweaks to top-level readme

heapsource/nuodb-drivers,heapsource/nuodb-drivers,mjmichaels/nuodb-drivers,mjmichaels/nuodb-drivers,mjmichaels/nuodb-drivers,heapsource/nuodb-drivers,heapsource/nuodb-drivers,mjmichaels/nuodb-drivers,heapsource/nuodb-drivers,heapsource/nuodb-drivers,mjmichaels/nuodb-drivers,mjmichaels/nuodb-drivers,mjmichaels/nuodb-drivers,heapsource/nuodb-drivers,heapsource/nuodb-drivers,mjmichaels/nuodb-drivers