Initial light control widget; final fixes for kobo light
update koreader-base.
Add an option "make koboupdate"
Merge pull request #201 from giorgio130/master

Initial light control widget; final fixes for kobo light
Changed "koboupdate" to be more reliable as an installation mean.
Add firmware detection for kobo, adjust input accordingly.
Merge pull request #206 from giorgio130/master

Other fixes for kobo
fix unnecessary frontlight module require