THIRD_PARTY: update references to external libraries

* transifex-client is no longer used
* jar files are no longer relevant when using gradle
* update floatingactionbutton version number
* Clarify that jackrabbit is using through the library project

THIRD_PARTY.txt

@@ -37,43 +37,32 @@ that govern this software, for the purposes they are being used.
 
 The third party software included and used by this project is:
 
- * Apache JackRabbit 2.12.4.
+ * Apache JackRabbit 2.12.4. (included by the android-library project)
    Copyright (C) 2004-2016 The Apache Software Foundation.
    Licensed under Apache License, Version 2.0.
-   The jar file must be included in the Nextcloud client APK.
+   The library is included in the Nextcloud client APK.
    See http://jackrabbit.apache.org/
  
- * Transifex client.
-   Copyright (C) Transifex.
-   Licensed under GNU General Public License.
-   Placed at third_party/transifex-client.
-   Used as a helper tool, not included in the Nextcloud client APK.
-   Original license document included at third_party/transifex-client/LICENSE.
-   See http://help.transifex.com/features/client/
-   
  * TouchImageView, 1.2.0. commit 6dbeac4f11936185ba374c73144ac431c23c9aab
    Copyright (c) 2014 Michael Ortiz
    Licensed under MIT License
-   JAR file libs/touch-image-view.jar has been generated by ownCloud Inc., including without 
-   modifications com.ortiz.touch.ExtendedViewPager and com.ortiz.touch.TouchImageView classes. 
+   This library is in the source code.
    See https://github.com/MikeOrtiz/TouchImageView
  
- * floatingactionbutton 1.10.1.
+ * floatingactionbutton 1.10.21.
    Copyright (c) 2014 Jerzy Chalupski
    Licensed under Apache License, Version 2.0.
-   The jar file must be included in the Nextcloud client APK.
+   The library is included in the Nextcloud client APK.
    See https://github.com/futuresimple/android-floating-action-button 
  
  * AndroidSVG 1.2.1.
    Copyright (c) 2014 Paul LeBeau
    Licensed under Apache License, Version 2.0.
-   placed at libs/androidsvg-1.2.1.jar
-   The jar file must be included in the Nextcloud client APK.
+   The library is included in the Nextcloud client APK.
    See https://github.com/BigBadaboom/androidsvg
    
  * Disk LRU Cache 2.0.2.
    Copyright (c) 2013 Jake Wharton 
    Licensed under Apache License, Version 2.0.
-   placed at libs/disklrucache-2.0.2.jar
-   The jar file must be included in the Nextcloud client APK.
-   See https://github.com/JakeWharton/DiskLruCache
+   The library is be included in the Nextcloud client APK.
+   See https://github.com/JakeWharton/DiskLruCache