Merge branch 'contact-selector-controller' into 'master'

...droid/src/org/briarproject/android/ActivityComponent.java

...-android/src/org/briarproject/android/ActivityModule.java

briar-android/src/org/briarproject/android/BaseActivity.java

.../briarproject/android/contact/BaseContactListAdapter.java

...oid/src/org/briarproject/android/contact/ContactItem.java

.../org/briarproject/android/contact/ContactListAdapter.java

...src/org/briarproject/android/contact/ContactListItem.java

.../android/contactselection/BaseContactSelectorAdapter.java

...android/contactselection/BaseContactSelectorFragment.java

...ect/android/contactselection/ContactSelectorActivity.java

...ject/android/contactselection/ContactSelectorAdapter.java

...t/android/contactselection/ContactSelectorController.java

...droid/contactselection/ContactSelectorControllerImpl.java

...ect/android/contactselection/ContactSelectorFragment.java

...ect/android/contactselection/ContactSelectorListener.java

...ect/android/contactselection/SelectableContactHolder.java

...oject/android/contactselection/SelectableContactItem.java

...ndroid/privategroup/creation/BaseGroupInviteActivity.java

...ct/android/privategroup/creation/CreateGroupActivity.java

.../android/privategroup/creation/CreateGroupController.java