fix backbutton in RogNirdeshikaActivity.java
fix orientation for rognirdeshika 6 slide
remove useless slide
add volley.jar
Merge branch 'master' of https://github.com/Apptitive/Ma-o-Shishu
Add ImportantMessageComparator.java. Stop passing pregnancyOrChildBirthday from RegistrationFragment and NotificationReceiver. Work on due notification logic.

Still in progress and current logic is unstable.