Bump version to v0.12.0 for release.
Handle FedEx response with empty destination

In some cases, a DestinationAddress element is provided containing only a
Residential element
Shipwire now returns 401 Unauthorized when bad credentials are provided vs successful response but error in body
Bump active_utils to 2.2.0
v0.12.1
deploy using shipit
bump version to 0.12.2
use default release task from bundler/gem_tasks
Set maximum number of packages for ShipmentPacker.pack
Bump version to 0.12.3
Test under ruby 2.1
raise earlier if the maximum number of packages is exceeded
Bump version to 0.12.4
Refactors combining addresses 2 and 3
Bumps version to 0.12.5 from 0.12.4
Pack things a little more efficiently
Loop less, raise early, test exception order
Symbolize earlier
Comment for the min magic
Don't modify the inputs to packer aside from symbolize_keys