better error for directories that aren't spells. (#439)
better error for directories that aren't spells. (#439)

Fixes #429.

Signed-off-by: Michael McCracken <678f76d0129c6a47299e3c6abb92ed26d253a960@canonical.com>
conjure-up/conjure-up,Ubuntu-Solutions-Engineering/conjure,battlemidget/conjure-up,battlemidget/conjure-up,Ubuntu-Solutions-Engineering/conjure,ubuntu/conjure-up,conjure-up/conjure-up,ubuntu/conjure-up