fix: pass .nyc_output temp folder

feat: use --env coverage=false to disable code coverage (cypress-io#68)

You can skip the client-side code coverage hooks by setting the environment variable `coverage` to `false`.

```shell
cypress run --env coverage=false
cypress open --env coverage=false
CYPRESS_coverage=false cypress run
```

See different ways of setting env variables https://on.cypress.io/environment-variables

feat: add Nextjs example and middleware, close cypress-io#63

fix: remove cp-file

feat: add non .babelrc method (cypress-io#48)

fix: only ask for server-side coverage when there is url to ask (cypr…

…ess-io#46)

fix: update nyc reporter to lcov (cypress-io#34)

* fix: update nyc reporter to lcov

* docs: add LCOV report to README

fix: replace sourcemap's path by the corresponding absolute file path (…

…cypress-io#23)

feat: add hapi middleware

feat: add server-side middleware and merge the backend coverage with …

…frontend (cypress-io#22)

* chore: add middleware and merge server-side coverage

* chore: configure coverage url

* finish docs and add link to the realworld repo