WIP Normalize for diacritics

PR branch for #729

Tasks to do
- [x] unicode normalization client side for page search with unorm and xregexp
- [x] unicode normalization for ES queries, setting up analyzers
- [x] unicode normalization for backend stream
- [x] add tests
- [ ] launch a showcase dokku instance 
`text = ''.join(c for c in text if not unicodedata.combining(c))`

One of the first results when searching google for "python ascii folding". http://stackoverflow.com/a/517974/945546