rename configurator's onDraw method to onDrawListener

Signed-off-by: wenpincui <wenpincui224@gmail.com>
Merge branch 'pull' of http://github.com/wenpincui/android-pdfview into wenpincui-pull

Merge branch 'pull' of http://github.com/wenpincui/android-pdfview into wenpincui-pull