Update koreader-base
Merge pull request #234 from thotypous/master

Update koreader-base
Merge pull request #235 from houqp/houqp-master

reset current page on item_table switch for menu widget
Change util.isEmulated to boolean and fix frontlight

Device:hasFrontlight always returned a true-like value because util.isEmulated was an integer.
Fixed this, also, used a polymorphic object design to reduce FrontLight code, and
adapted BaseFrontLight for the emulator.
Merge pull request #236 from thotypous/frontlight-fixes

Change util.isEmulated to boolean and fix frontlight
Fix crash when trying to go to / on FM

Deals with more cases in FileChooser:compressPath, including `/mnt/..`.
Merge pull request #237 from thotypous/fix-crash-root

Fix crash when trying to go to / on FM
Remove FileChooser:compressPath, use util.realpath
Use ReaderFrontLight:addToMainMenu in FM

Check if frontlight is present using the same method as ReaderFrontLight:init,
just for consistency.
Merge pull request #238 from thotypous/realpath

Realpath
add hidden file toggle