add text highlight in both reflow and non-reflow mode
disable word OCR for now
Since it will crash the reader with a strange error message saying
"terminate called after throwing an instance of 'DJVU::GException'"
even though only PDF file is opened.
update koreader-base submodule
Merge remote-tracking branch 'upstream/master' into text_highlight
add json parser library from http://regex.info/blog/ (Public domain license)
add a demo version dictionary
Merge pull request #85 from chrox/text_highlight

add text highlight in both reflow and non-reflow mode