Remove sonarqube integration

Makefile

@@ -1,9 +1,6 @@
 checkstyle:
 	./gradlew checkstyle
 
-sonarqube:
-	./gradlew sonarqube
-
 test:
 	# See libandroid-navigation/build.gradle for details
 	./gradlew :libandroid-navigation:test

build.gradle

@@ -46,6 +46,4 @@ subprojects {
 
 task clean(type: Delete) {
   delete rootProject.buildDir
-}
-
-apply from: "${rootDir}/gradle/sonarqube.gradle"
+}

circle.yml

@@ -32,9 +32,6 @@ jobs:
       - run:
           name: Run unit-test and generate Jacoco test report
           command: ./gradlew createDebugUnitTestCoverageReport
-#      - run:
-#          name: Sonarcloud upload
-#          command: make sonarqube
       - run:
           name: Build release to test ProGuard rules
           command: ./gradlew app:assembleRelease

gradle/dependencies.gradle

@@ -40,7 +40,6 @@ ext {
       errorprone       : '0.0.13',
       coveralls        : '2.8.1',
       spotbugs         : '1.3',
-      sonarqube        : '2.6-rc1',
       gradle           : '3.1.2',
       dependencyGraph  : '0.3.0',
       dependencyUpdates: '0.20.0'
@@ -108,7 +107,6 @@ ext {
       gradle           : "com.android.tools.build:gradle:${pluginVersion.gradle}",
       checkstyle       : "com.puppycrawl.tools:checkstyle:${pluginVersion.checkstyle}",
       spotbugs         : "gradle.plugin.com.github.spotbugs:gradlePlugin:${pluginVersion.spotbugs}",
-      sonarqube        : "org.sonarsource.scanner.gradle:sonarqube-gradle-plugin:${pluginVersion.sonarqube}",
       coveralls        : "org.kt3k.gradle.plugin:coveralls-gradle-plugin:${pluginVersion.coveralls}",
       errorprone       : "net.ltgt.gradle:gradle-errorprone-plugin:${pluginVersion.errorprone}",
       dependencyGraph  : "com.vanniktech:gradle-dependency-graph-generator-plugin:${pluginVersion.dependencyGraph}",