Merge pull request #827 from houqp/houqp-master

add more info for emulation mode
Merge pull request #828 from houqp/houqp-master

use left arrow key as shortcut for going back to parent dir
Merge pull request #829 from houqp/houqp-master

make history dir in bootstrapemu target
Merge pull request #830 from houqp/houqp-master

add gettext support
Merge pull request #832 from houqp/houqp-master

update koreader-base
update koreader-base url to avoid permission deny
Merge pull request #833 from chrox/master

update koreader-base url to avoid permission deny
add missing gettext.lua file in customupdate
Merge pull request #836 from chrox/master

add missing gettext.lua file in customupdate