Compose messages directly from ConversationActivity. Bug #32.

briar-android/AndroidManifest.xml

...org/briarproject/android/contact/ContactListActivity.java

...rg/briarproject/android/contact/ConversationActivity.java

...org/briarproject/android/contact/ConversationAdapter.java

...arproject/android/contact/ReadPrivateMessageActivity.java

...rproject/android/contact/WritePrivateMessageActivity.java

...id/src/org/briarproject/android/groups/GroupActivity.java

...rc/org/briarproject/android/groups/GroupListActivity.java

...rg/briarproject/android/groups/ReadGroupPostActivity.java

...g/briarproject/android/groups/WriteGroupPostActivity.java

...android/src/org/briarproject/android/util/AuthorView.java

...src/org/briarproject/android/util/CommonLayoutParams.java

...ndroid/src/org/briarproject/android/util/LayoutUtils.java