Sort threaded messages generic

Constructed a generic that we can use to sort threaded messages.

Closes #393

See merge request !203

added parent id to metadata and a unit test

The parent id, a necessary attribute for nested forums, was not being added to the metadata in the forum manager. Additionally, a simple forum manager unit was created.

See merge request !202

android.support.v7.widget.AppCompatButton -> Button to use AppCompat inflater

Fixes the following crash that occurs after upgrading to support 23.3.0:
https://code.google.com/p/android/issues/detail?id=174871

Closes #334.

See merge request !200

Fixes the following crash that occurs after upgrading to support 23.3.0:
https://code.google.com/p/android/issues/detail?id=174871

Introduce a MessageContext class to be used by all validators

This change will allow to pass message dependencies from the client validators to the `ValidationManager`.

Please see my thoughts in #382 for more details.

See merge request !197

This change will allow to pass message dependencies from the client
validators to the ValidationManager.

Forum Sharing Status

The new activity shows who you are sharing a forum with and who shares a
forum with you. It is accessible from the overflow menu when in a forum.

![device-2016-05-13-153259](/uploads/2e1c651bc72094018dd0f97a37453d1b/device-2016-05-13-153259.png)

Closes #398

See merge request !191

The new activity shows who you are sharing a forum with and who shares a
forum with you. It is accessible from the overflow menu when in a forum.

Closes #398

Handle invitations to the same forum by multiple contacts

This also uses the new metadata queries in the forum sharing client.

Please note that this is based on !184.

See merge request !188

Closes #391

Closes #392

Replace BDF data structures with classes in forum sharing client

This introduces two new classes for protocol session states: One for the sharer and one for the invitee.
The respective classes for protocol state machines and actions have been moved into these classes as inner classes.
The two new classes replace the `BdfDictionary` that was used before to represent the local state information of a forum sharing session.

A similar technique is used for local actions and protocol messages.

Local actions are just represented by one Enum and protocol messages have their own classes now that also handle serialization into BdfDictionaries and BdfLists.

Closes #378 

See merge request !184

Turn the UI of `CreateIdentityActivity` into XML

Closes #395

See merge request !194

Contact List Unread Messages

Adds unread count as bubble to avatar image in contact list.

Please note that this is based on !190.

![device-2016-05-18-124534](/uploads/647dbdcff73a69eb6cf1814f85cbffe6/device-2016-05-18-124534.png)![device-2016-05-18-124339](/uploads/fa56a44f229234bb86fdebf8f9060927/device-2016-05-18-124339.png)

Closes #399

See merge request !192

Increase Avatar border and change shadow color

![device-2016-05-16-123230](/uploads/8000fb506ee91e61149f838b3f661b46/device-2016-05-16-123230.png)
![device-2016-05-16-123251](/uploads/723bf452704f18b519c3fbdc469595a7/device-2016-05-16-123251.png)

See merge request !190

Convert ExpiredActivity to XML

Closes #396

See merge request !196

Closes #399

Extract ForumFactory from ForumManager

The code for creating forums in ForumManager was used by
ForumSharingManager and also needed by InviteeEngine.
This extracts it into its own class.

Closes #375

See merge request !195

Closes #396

The code for creating forums in ForumManager was used by
ForumSharingManager and also needed by InviteeEngine.
This extracts it into its own class.

Closes #375

Closes #395

Disable Conversation Exit Transition and Animate Bulb

Works-around #318

See merge request !193

Clean up Introduction Session States

...for introducer when both introducees have been deleted.

It can't be deleted when only one introducee is removed, because then all messages in the private conversation with the other introducee will disappear, because their corresponding session state can't be found anymore.

Closes #372

See merge request !189

Upgrade Gradle to 2.13, add local Maven repo



See merge request !186

for introducer when both introducees have been deleted.

Closes #372

Simple metadata queries

Adds support for retrieving metadata that matches all key/value pairs in a query object. This is a minimal version of #222 that can be extended if we need other query capabilities.

See merge request !187

Rotate crash fix

The problem was that two controllers were trying to unbind the Briar service where of course only one was needed.

I did the following

* Restructured the relevant Controllers
* Made a more permanent solution so that the last fragment will always be reloaded on config changes and Activity restarts.

Closes #386

See merge request !183

Added support for retrieving metadata that matches all key/value pairs in a query.