bug fix: reader crashes when table of content is empty
Merge pull request #742 from houqp/new_ui_houqp

bug fix: reader crashes when table of content is empty
fix bug in getPitch, returning half of ptich for 4bpp fb
Merge branch 'new_ui_fix' of git://github.com/houqp/kindlepdfviewer into new_ui_code
fix visible_area recalculate for manual crop in reflow mode
Merge pull request #745 from houqp/new_ui_code

fix bug in getPitch, returning half of ptich for 4bpp fb
properly set up shadow buffer's pitch and bug fix on eink update

previously, counters never reach 0!
get correct screen width in Screen.lua
add more comments
Merge pull request #747 from chrox/new_ui_code

fix visible_area recalculate for manual crop in reflow mode
Merge branch 'new_ui_code' of github.com:hwhw/kindlepdfviewer into new_ui_code
Merge pull request #750 from houqp/new_ui_code

bug fix for einkfb.c and screen.lua
fix coordinate calculation for blitbuffer rotation
Merge branch 'new_ui_code' of github.com:hwhw/kindlepdfviewer into new_ui_code
Merge pull request #751 from houqp/new_ui_code

fix coordinate calculation for blitbuffer rotation