The allocate() method allows to use an IPAddress::IPv4 or ::IPv6 object
to allocate individual host addresses so that the IPAddress object
tracks the state of which address was previously allocated.

Example:

  ip = IPAddress("10.0.0.0/24")
  ip.allocate
    #=> "10.0.0.1/24"
  ip.allocate
    #=> "10.0.0.2/24"

There is support for both IPv4 and IPv6 with full test coverage.

Integer Unification for Ruby 2.4.0+

Add IPv6#link_local?

Travis CI fix

See https://github.com/codeclimate/ruby-test-reporter/blob/master/README.md#upgrading-from-pre-10-versions for details.

Add Travis, CodeClimate, and Jeweler

…and gem install stuff in travis

70 contributing md

# Conflicts:
#	.gitignore

add minitest to development group in Gemfile

Remove duplicate multicast? method

The ```multicast?``` method was defined twice.

Avoid Ruby 1.8 compatibility when using Ruby 2.1.8

[#67]