default theme : small modifications

- more smartphone friendly
- more text browser friendly
- next button always on the right
- in case of small screen supporting touch event, categories are displayed on one line with a scroll

print error if https rewrite directory is not found, #116

add faroo engine

Implementing https rewrite support

* licenced under GPLv3+
* downloaded from https://github.com/EFForg/https-everywhere

* parsing XML-Files which contain target, exclusions and rules
* convert regex if required (is a little hack, probably does not work
for all rules)
* check if target rule apply for http url, and use the rules to rewrite
it
* add pice of code, to check if domain name has not changed during
rewrite (should be rewritten, using publicsuffix instead of little hack)

Search Music also on YouTube

YouTube hosts a lot of music and should be enabled for Music search by default.

add japanese translation

[fix] the bang was included in the search string, [mod] infoboxes modifications

[enh] add infoboxes and answers, [fix] when two results are merged, really use the content with more text

fix float division by zero bug in score calculation

[enh] Add french translation for webapp.

FIX: #101 implement query parser and use it inside autocompletion and search query extraction