modified gradle config (building works again)

android/build.gradle

@@ -1,5 +1,5 @@
 android {
-    buildToolsVersion "21.0.1"
+    buildToolsVersion "21.1.2"
     compileSdkVersion 21
     sourceSets {
         main {

build.gradle

@@ -26,6 +26,9 @@ allprojects {
         mavenCentral()
         maven { url "https://oss.sonatype.org/content/repositories/snapshots/" }
         maven { url "https://oss.sonatype.org/content/repositories/releases/" }
+        flatDir {
+            dirs '../lib'
+        }
     }
 }
 
@@ -60,7 +63,7 @@ project(":core") {
 
     dependencies {
         compile "com.badlogicgames.gdx:gdx:$gdxVersion"
-        compile files("lib/absGDX-framework-1.0.jar")
+        compile name: 'absGDX-framework-1.0'
     }
 }