Prompt for username/password when not in config file.
Update docs.
Merge pull request #4 from bhearsum/username-prompt

Prompt for username/password when not in config file.
Merge branch 'master' of github.com:uberj/inv-tool
add README comment about creating invtool.conf with host/port of inventory
Merge pull request #6 from floatingatoll/patch-1

add README comment about creating invtool.conf with host/port of inventory
Make auth lazy.

This makes it possible to run stuff like --help without entering
credentials.
let env resolve which python we get. fixes #3
kv stuff
working on bi stuff
SREG and HWAdapter work
refactored kv stuff and added ro interface to network/site objects
added vlan ro kv interface
added site vlan interfaces
formating
fixing atolls bug
rest api for networks vlans and sites
small unicode fix
added KV crud support for VLAN/NET/SITE objects
missed this during a rebase?