Add unicode support to searches

[atoomic]

As described in #5 currently searches using unicode characters return no results as any non ascii characters is removed from the query. We could probably improve the whitelist to add support to unicode characters.

[atoomic]

for now add a workaround via 272cee6
this is not fixing the problem by itself but this provides a more usable workaround
instead of returning no matches when using unicode characters, this would show some results ( with some false positives )