[WIP] Abstract database calls (#157)

__tests__/__snapshots__/RoomItem.js.snap

__tests__/__snapshots__/Storyshots.test.js.snap

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

app/actions/index.js

app/constants/types.js

app/containers/Avatar.js

app/containers/MessageBox/index.js

app/containers/MessageErrorActions.js

app/containers/Routes.js

app/containers/Sidebar.js

app/lib/realm.js

app/lib/rocketchat.js

app/reducers/permissions.js

app/reducers/reducers.js

app/reducers/server.js

app/sagas/init.js

app/sagas/selectServer.js

app/views/ListServerView.js

app/views/LoginView.js

app/views/RoomView/Header/index.js