ui: bump to material design

ring-android/app/app.iml

ring-android/app/build.gradle

...c/main/java/cx/ring/adapters/AccountSelectionAdapter.java

.../src/main/java/cx/ring/adapters/SectionsPagerAdapter.java

...ndroid/app/src/main/java/cx/ring/client/CallActivity.java

...ndroid/app/src/main/java/cx/ring/client/HomeActivity.java

...id/app/src/main/java/cx/ring/fragments/AboutFragment.java

...c/main/java/cx/ring/fragments/AccountWrapperFragment.java

...in/java/cx/ring/fragments/AccountsManagementFragment.java

...oid/app/src/main/java/cx/ring/fragments/CallFragment.java

.../main/java/cx/ring/fragments/CallableWrapperFragment.java

.../app/src/main/java/cx/ring/fragments/DialingFragment.java

...pp/src/main/java/cx/ring/fragments/DropActionsChoice.java

.../app/src/main/java/cx/ring/fragments/HistoryFragment.java

...oid/app/src/main/java/cx/ring/fragments/HomeFragment.java

...oid/app/src/main/java/cx/ring/fragments/MenuFragment.java

...pp/src/main/java/cx/ring/fragments/TransferDFragment.java

...oid/app/src/main/java/cx/ring/loaders/AccountsLoader.java

...roid/app/src/main/java/cx/ring/loaders/HistoryLoader.java

...p/src/main/res/drawable-hdpi/ic_add_circle_white_48dp.png