* Integrate cli as a binary built as part of tantivy-core
** Pros
*** Builds every commit
*** Allows prospective users to try tantivy
** Cons
*** Increases build time
*** Slows down core feature development
    If every core feature requires changing the example cli, it will slow down review and fixing of core library functionality

* Outline
** DONE Update to rust edition 2018
   CLOSED: [2019-10-19 Sat 20:28]
** DONE Add all datatypes supported by the library to the dialog
   CLOSED: [2019-10-19 Sat 22:33]
** TODO test locally with a dependency on master of local tantivy
* Further work
** TODO Skip fields found in json, but not in the schema instead of erroring