Skeleton subnets doc
Actually add skeleton implementation
Further fleshing out implementation
Merge branch 'master' into state-subnet
Further fleshing out
Minor fixes
Strip out unneeded code
Fledgling test
Getter methods
Test extension
Test extension
Test extension
Test extension
Merge branch 'master' into state-subnet
Test for subnet.Destroy()
Destroy should be a no-op if already dead
Typo fix
Changes from review, tests not fixed yet
Add unique index for subnets providerid field
Test unique index on provider id