Make --username and --password required in deployer

[mrotteveel]

The username and password are optional in deployer, consider making them required (or at minimum display a warning when left off). I was trying to install fbjava, and I had made a typo in the --password option (I typed --pasword instead) and it took me a while to notice that typo ;).

[asfernandes]

@mrotteveel but it's valid in FB 3 to not use them.

[mrotteveel]

Maybe then display a warning for unrecognized options and --username without --password (and vice versa)?