Check for the right two tag indexes #207 (#208)

Some doc links that did not work and travis validation of api-docs (#…

…188)

* Some doc links that did not work and travis validation of api-docs
* Also validate the lagom module apidocs
* Hard to keep both scaladoc and the compiler happy but this seems to do the trick

Keeping track of the persistent actors fixed #169

Index check also for snapshot plugin (#131)

Additional work on top of the async-client and indexes from #81