Depend on USI artifacts. (#72)

Summary:
We will no longer depend on USI as a source dependencies but on its
artifacts.

Author: jeschkies

build.gradle

@@ -9,10 +9,14 @@ plugins {
 
 repositories {
     jcenter()
+    maven {
+        name "Mesosphere Public Repo"
+        url "https://downloads.mesosphere.com/maven"
+    }
 }
 
 ext {
-    usiBranch = 'master'
+    usiVersion= '0.1.5'
     scalaVersion = '2.12'
     akkaVersion = '2.5.19'
 }
@@ -21,10 +25,10 @@ dependencies {
     // This dependency is exported to consumers, that is to say found on their compile classpath.
     api 'org.apache.commons:commons-math3:3.6.1'
     api 'com.google.guava:guava:26.0-jre'
-    api ('com.mesosphere.usi:core') { version { branch = usiBranch } }
-    api ('com.mesosphere.usi:core-models') { version { branch = usiBranch } }
-    api ('com.mesosphere.usi:mesos-client') { version { branch = usiBranch } }
-    api ('com.mesosphere.usi:persistence') { version { branch = usiBranch } }
+    api group: 'com.mesosphere.usi', name: 'core', version: usiVersion
+    api group: 'com.mesosphere.usi', name: 'core-models', version: usiVersion
+    api group: 'com.mesosphere.usi', name: 'mesos-client', version: usiVersion
+    api group: 'com.mesosphere.usi', name: 'persistence', version: usiVersion
     api group: 'org.slf4j', name: 'slf4j-api', version: '1.7.25'
 
     // Test dependencies
@@ -33,7 +37,7 @@ dependencies {
     testImplementation 'org.glassfish:javax.json:1.0.4'
     testImplementation 'org.junit.jupiter:junit-jupiter-api:5.3.1'
     testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.3.1'
-    testImplementation('com.mesosphere.usi:test-utils') { version { branch = usiBranch } }
+    testImplementation group: 'com.mesosphere.usi', name: 'test-utils', version: usiVersion
     testImplementation 'org.awaitility:awaitility:3.1.6'
 
     compileOnly 'com.github.spotbugs:spotbugs-annotations:3.1.3'

settings.gradle

@@ -1,10 +1 @@
 rootProject.name = 'mesos'
-
-sourceControl {
-    gitRepository("https://github.com/mesosphere/usi.git") {
-        producesModule("com.mesosphere.usi:core")
-        producesModule("com.mesosphere.usi:core-models")
-        producesModule("com.mesosphere.usi:mesos-client")
-        producesModule("com.mesosphere.usi:test-utils")
-    }
-}