Log Message:
[wip/zathura] Upgrade to 0.2.3

Changes since 0.2.2:
    
 - LRU caching algorithm
 - Bisect functionality
 - Allow negative offsets
 - Option -page to open at the specified page
 - Scale vertical/horizontal scrolling in respect to the buffer
 - Add statusbar-basename option
 - Implement colors for "Loading..."-text
 - Don't render same page multiple times
 - Use libmagic if available
 - Some other bug fixes and updated translations