Removed proguard.

This removes some complications with -keep flags etc (but seems
to increase compile time and file size for release builds slightly).

app/build.gradle

@@ -31,16 +31,9 @@ android {
         testInstrumentationRunner "com.android.test.runner.MultiDexTestRunner"
     }
 
-    buildTypes {
-        debug {
-            applicationIdSuffix ".debug"
-            minifyEnabled false
-            testCoverageEnabled true
-        }
-        release {
-            minifyEnabled true
-            proguardFile file("proguard-rules.pro")
-        }
+    buildTypes.debug {
+        applicationIdSuffix ".debug"
+        testCoverageEnabled true
     }
 
     // Increasing minSdkVersion reduces compilation time for MultiDex.

app/proguard-rules.pro

@@ -1,29 +0,0 @@
-# Add project specific ProGuard rules here.
-# By default, the flags in this file are appended to flags specified
-# in /home/felix/software/android-studio/sdk/tools/proguard/proguard-android.txt
-# You can edit the include path and order by changing the proguardFiles
-# directive in build.gradle.
-#
-# For more details, see
-# http://developer.android.com/guide/developing/tools/proguard.html
-# Add any project specific keep options here:
-# If your project uses WebView with JS, uncomment the following
-# and specify the fully qualified class name to the JavaScript interface
-# class:
-#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
-# public *;
-#}
--dontoptimize
--dontobfuscate
--dontpreverify
--dontwarn scala.**
--keep class !scala*.** { *; }
-# Avoid crash when invoking String.toInt (see https://issues.scala-lang.org/browse/SI-5397).
--keep class scala.collection.SeqLike {
-    public protected *;
-}
-
-# Disable warnings for Guava annotations.
--dontwarn javax.annotation.**
--dontwarn javax.inject.**
--dontwarn sun.misc.Unsafe