Log Message:
Update otter-browser from 0.9.9 to 0.9.10

Local changes
=============
Start to depend on textproc/hunspell.

Upstream changelog
==================
Emdek released 0.9.10 on 1 May 2016

    added initial support for User Scripts;
    added Addons Manager;
    added alternative display mode and support for optional headers for URL \ 
completion in address field;
    many enhancements in experimental backend for QtWebEngine (Blink):
        added support for entering full screen mode;
        added support for content blocking;
        added support for several missing actions;
    several fixes and improvements in content blocking;
    improved CMake build system (also now it is the only officially supported);
    added new backend for storing browsing history;
    many other fixes and improvements.