Having pure Go snowball stemmers allows us to add support for
many languages into the core of bleve. Specifically we just
added: Russian, Danish, Finnish, Hungarian, Dutch, Norwegian,
Romanian, Swedish, Turkish
rather than having each package include it directly inside of
bleve, we have decide to host them all in one repo
https://github.com/blevesearch/snowballstem
this makes the easier for the rest of the community to use
outside of bleve contexts
this introduces a new light Spanish stemmer
and move the other pure Go Spanish analysis components back
in from the blevex package
the libstemmer version of the stemmer will remain in blevex
this introduces new German light stemmer
and moves the other pure Go german analysis components back
in from the blevex package
the libstemmer version of the stemmer will remain in blevex