Add push notification functionality

.gitignore

android/app/build.gradle

android/app/google-services.json

android/app/src/main/AndroidManifest.xml

android/app/src/main/java/com/thaliapp/MainApplication.java

android/app/src/main/res/mipmap-hdpi/ic_notification.png

android/app/src/main/res/mipmap-mdpi/ic_notification.png

android/app/src/main/res/mipmap-xhdpi/ic_notification.png

android/app/src/main/res/mipmap-xxhdpi/ic_notification.png

android/app/src/main/res/mipmap-xxxhdpi/ic_notification.png

android/build.gradle

android/settings.gradle

app/actions/pushNotifications.js

app/app.js

app/sagas/index.js

app/sagas/login.js

app/sagas/pushNotifications.js

ios/Podfile

ios/Podfile.lock

ios/ThaliApp.xcodeproj/project.pbxproj