v0.18

release v0.18

        - add SameSite support (RT#133009)
        - convert optional test using Test::WWW::Mechanize::Catalyst to
          mandatory test using Catalyst::Test
        - convert from Module::Install to Distar for packaging and release
          process
        - fix running Makefile.PL when . is not included in @INC (RT#121882)
        - minor test cleanups
        - typo and spelling fixes in documentation
        - convert repository to git (fREW Schmidt)