Solve bug #210.
Merge pull request #258 from giorgio130/master

Solve bug #210.
update koreader-base
Merge pull request #259 from chrox/master

update koreader-base
update k2pdfopt to version 2.00
add a UTF8 character iterator

this speeds up font rendering since LuaJIT doesn't have to use
the interpreter for string.gsub(), which was used before
fixed bugs in implementation of utf8Chars()
Merge pull request #261 from hwhw/master

add a UTF8 character iterator
Merge pull request #260 from chrox/master

update k2pdfopt to version 2.00
update koreader-base for blitbuffer and ft ffi modules
Merge pull request #263 from houqp/houqp-master

update koreader-base for blitbuffer and ft ffi modules