implemented byteslice and getbyte
implemented local?() for MAC addresses
implemented DeviceUuid for UUIDs
get ready for ActiveModel 4:
use ActiveModel::ForbiddenAttributesProtection instead of ActiveModel::MassAssignmentSecurity
added tests for MacAddress
added tests for DeviceUuid
improved test task
updated dependencies in gemspec
improved Readme
bumped version to 0.0.2