Vimperator 3.15.0

• update and fix css related issues
• fix some mispellings
• fix command prompt selection getting cleared
• remove asciidoc.conf and regressions.js
• use sanitizer based on version
• fix shift-insert on linux
• honor hlsearch on n/N
• fix typeerror on :abclear
• fix smart completions on fx 49
• removed unused css
• change option from 'previouspattern' to 'prevpattern'. The old 'previouspattern' still works.
• canonicalize commandline history during matching
• fix alphabetic ordering of some doc items and add :dialog items
• add autocompletion for about:* urls
• fix [[ with "preview" buttons