Added loading progress bars to all ListViews that load from the DB.

...-android/src/net/sf/briar/android/blogs/BlogActivity.java

...roid/src/net/sf/briar/android/blogs/BlogListActivity.java

...d/src/net/sf/briar/android/blogs/ManageBlogsActivity.java

...src/net/sf/briar/android/contact/ContactListActivity.java

.../src/net/sf/briar/android/contact/ContactListAdapter.java

...ndroid/src/net/sf/briar/android/groups/GroupActivity.java

...id/src/net/sf/briar/android/groups/GroupListActivity.java

...src/net/sf/briar/android/groups/ManageGroupsActivity.java

...c/net/sf/briar/android/messages/ConversationActivity.java

...t/sf/briar/android/messages/ConversationListActivity.java

.../net/sf/briar/android/widgets/ListLoadingProgressBar.java