Merge pull request #18 from giorgio130/master

Add Kobo devices support
fix a bug in patching popen_noshell.c
Merge pull request #19 from ddysher/master

Fix popen_noshell-buildfix.patch
add lightenRect to change background color of a rect
Merge pull request #20 from chrox/master

add lightenRect to change background color of a rect
check if glyph is missing in current fontface
Merge pull request #21 from chrox/master

check if glyph is missing in current fontface
Merge branch 'master', remote-tracking branch 'origin'