add GNU FreeFont for some rare charactors like phonetic symbols
add glyph fallbacks
if glyph is not found in specified fontface, fallback fonts are checked
on by one until a glyph is found.
add 'make fonts' command that merges additional fonts in resources into fonts pool
rm additional fonts in resources dir in customupdate
Merge pull request #124 from chrox/glyph_fallback

add glyph fallback
Merge pull request #125 from chrox/highlight

bugfix: remove selected word only if hold moves out of word box
update koreader-base for glyph checking
Merge pull request #126 from chrox/master

update koreader-base for glyph checking
add fake tap to dismiss temp hightlight after hightlight is saved