Merge pull request #27 from onyx-cap/master

俄语翻译
show CR3's option dialog instead of ReaderSettingsActivity
update option dialog's icons for EInk screen
coolreader settings suport dpad control
clean code
Merge pull request #28 from dxwts/master

回归主干
adjust page/down code for screen updating on RK2906
Merge remote-tracking branch 'origin/master'
update icon
Merge pull request #29 from dxwts/master

回归主干
add can delete bookmark