Remove unused dependencies (#759)

Signed-off-by: mueller-ma <mueller-ma@users.noreply.github.com>

mobile/build.gradle

@@ -88,11 +88,9 @@ dependencies {
     compile "com.android.support:design:26.1.0"
     compile 'com.android.support:multidex:1.0.2'
     compile 'com.android.support.constraint:constraint-layout:1.0.2'
-    compile 'com.google.code.gson:gson:2.8.0'
     compile 'org.jmdns:jmdns:3.5.1'
     compile 'com.squareup.okhttp3:okhttp:3.6.0'
     compile 'com.github.loopj:android-smart-image-view:d09783b9508af5996361437a54cc234b662e4c78'
-    compile 'com.github.shell-software:fab:1.1.2'
     //androidsvg commit as of July 16th 2017
     compile 'com.github.BigBadaboom:androidsvg:418cf676849b200cacf3465478079f39709fe5b1'
     compile 'com.github.apl-devs:appintro:v4.2.2'