diff --git a/lib/build.gradle b/lib/build.gradle
index 12dac15..94cd14f 100644
--- a/lib/build.gradle
+++ b/lib/build.gradle
@@ -1,34 +1,19 @@
 apply plugin: 'android-library'
 
-dependencies {
-    compile fileTree(dir: 'libs', include: '*.jar')
-}
-
 android {
-    compileSdkVersion 19
-    buildToolsVersion "19"
 
-    sourceSets {
-        main {
-            manifest.srcFile 'AndroidManifest.xml'
-            java.srcDirs = ['src']
-            resources.srcDirs = ['src']
-            aidl.srcDirs = ['src']
-            renderscript.srcDirs = ['src']
-            res.srcDirs = ['res']
-            assets.srcDirs = ['assets']
-        }
+  // Define these properties in the gradle.properties file in the root project folder
+  compileSdkVersion propTargetSdkVersion.toInteger()
+  buildToolsVersion propBuildToolsVersion
 
-        // Move the tests to tests/java, tests/res, etc...
-        instrumentTest.setRoot('tests')
+  defaultConfig {
+    minSdkVersion propMinSdkVersion.toInteger()
+    targetSdkVersion propTargetSdkVersion.toInteger()
+  }
 
-        // Move the build types to build-types/<type>
-        // For instance, build-types/debug/java, build-types/debug/AndroidManifest.xml, ...
-        // This moves them out of them default location under src/<type>/... which would
-        // conflict with src/ being used by the main source set.
-        // Adding new build types or product flavors should be accompanied
-        // by a similar customization.
-        debug.setRoot('build-types/debug')
-        release.setRoot('build-types/release')
-    }
+  sourceSets.main {
+    manifest.srcFile 'AndroidManifest.xml'
+    java.srcDirs = ['src']
+    res.srcDirs = ['res']
+  }
 }
diff --git a/lib/proguard-project.txt b/lib/proguard-project.txt
deleted file mode 100644
index f2fe155..0000000
--- a/lib/proguard-project.txt
+++ /dev/null
@@ -1,20 +0,0 @@
-# To enable ProGuard in your project, edit project.properties
-# to define the proguard.config property as described in that file.
-#
-# Add project specific ProGuard rules here.
-# By default, the flags in this file are appended to flags specified
-# in ${sdk.dir}/tools/proguard/proguard-android.txt
-# You can edit the include path and order by changing the ProGuard
-# include property in project.properties.
-#
-# 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 *;
-#}