align APIs for async and sync versions of search results

release docs

update readme

fix edge case with file lookup for KotlinForExample

update docs

change the badge back to what it should be

Merge pull request jillesvangurp#16 from jillesvangurp/async-index-da…

…o-and-bulk

Async index dao and bulk

work around deprecation issues

prepare for generating epub from the manual

improve co-routine documentation