grueni

I followed thoroughly the instructions from [ibm 2015](https://developer.ibm.com/dwblog/2015/text-search-apache-couchdb/). You should read the instructions from [cloudant 2017](https://github.com/cloudant-labs/dreyfus/wiki/Introduce-dreyfus-into-couchdb) too. They differ in some points. If you would like to use the tests...