Add basic host management with drivers
Add basic Digital Ocean driver
Flags configuration
f: DO
Make digital ocean image, region, size etc configurable
Add more logging when creating
Create host config before creating driver
Don't explode listing hosts if single host is broken
Rename drivers
Register drivers instead of hard coding
Don't check if boot2docker ISO has been downloaded
Make boot2docker URL configurable
Mount vbox share for OS X
Refactor the sharing code a bit to make future enhancement more straightforward and to make it not fail on Linux
Virtualbox driver only has IP when running
Update CLI help text
List available drivers
Don't create host directory until config flags have been validated/set
Add "hosts" to main help text
Unset active host when removing active host