Merge branch 'hotfix/0.2.1'
Merge branch 'release/0.3.0'
Implement cidr ranges in option parser.

Ex: --cidr 54.0.0.0/24  or  --cidr 54.100.210.5/32
Added netaddr requirement
Fixed typo
Merge branch 'sethdmoore-feature/accept-cidr-ranges' into develop

Conflicts:
	aws_ec2_assign_elastic_ip/settings.conf
Bumped version to 0.4.0
Merge branch 'release/0.4.0' into develop
Bumped version to 0.5.0a1