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'
Merge pull request #29 from dxwts/master

回归主干
add can delete bookmark
update code according changes in OnyxAndroidSDK
Merge branch 'master' of github.com:onyx-cap/crengine
Merge pull request #30 from onyx-cap/master

添加bookmark界面删除功能
adjust update settings