Add inch and yard to :docs group.
Delete Dhcp::Consts.
Fix `already initialized constant Pio::DHCP' error (closes #50).
Merge pull request #51 from trema/feature/delete_dhcp_const

Feature/delete dhcp const
Add projectile configuration.
Delete lib/pio/util.rb
Delete lib/pio/message_util.rb.
Update bundled gems.
Update changelog.
Add examples/ to gem.
Version bump.
Merge branch 'release/0.4.0'
Merge tag '0.4.0' into develop

0.4.0