1. improve class DownloadDB for drm fulfillment;
2. add unittest.
change the slot methods for drm fulfillment.
Merge pull request #6 from qiujiejun/master

pull request for drm fulfillment issue
Merge branch 'master' of github.com:onyx-intl/booxsdk
improvement for glow light dialog.
Merge pull request #7 from hejh/master

improvement of glow light dialog.
fixed symbol "-" doesn't work in keyboard.
disable idle in full clock.
Merge branch 'master' of github.com:onyx-intl/booxsdk