make style and substance updates to model

[batemapf]

• added some verbose_name fields to pretty up the admin panel display
• added options to status to reflect more than a binary choice
• other minor style things, tidying the Client class

[toolness]

This looks good to me! @brendansudol what do you think?

[brendansudol]

love it!

[brendansudol]

this is great :)