add relish

relished strict_matchers
relish features WIP
working, except that the Generator needs to filter the ephermeral/informational headers
expect headers to be filtered
expect better description - not quite what i had in mind (was thinking of URL instead of Contract file), but it's an improvement
try out a new readme linked to relish, and reorganize relish to match readme
gotcha! :fishing_pole_and_fish: it worked locally but not on travis because of https://github.com/cucumber/cucumber/issues/52
Moving sections around README and relish
speed up relish with bundle install --local, avoiding timeouts