[Android] Fix the gradle build system to allow for building from terminal. It will now copy the library files correctly and sign the resulting apk.

Source/Android/build.gradle

@@ -10,12 +10,24 @@ apply plugin: 'android'
 
 dependencies {
 	compile fileTree(dir: 'libs', include: '*.jar')
+	compile fileTree(dir: "$buildDir/native-libs", include: 'native-libs.jar')
 }
 
 android {
-    compileSdkVersion 18
+	compileSdkVersion 19
-    buildToolsVersion "18.0.1"
+	buildToolsVersion "19.0.1"
 
+	task nativeLibsToJar(type: Zip, description: 'create a jar archive of the native libs') {
+		destinationDir file("$buildDir/native-libs")
+		baseName 'native-libs'
+		extension 'jar'
+		from fileTree(dir: 'libs', include: '**/*.so')
+		into 'lib/'
+	}
+
+	tasks.withType(Compile) {
+		compileTask -> compileTask.dependsOn(nativeLibsToJar)
+	}
 	sourceSets {
 		main {
 			manifest.srcFile 'AndroidManifest.xml'
@@ -39,4 +51,17 @@ android {
 		debug.setRoot('build-types/debug')
 		release.setRoot('build-types/release')
 	}
+	signingConfigs {
+		release {
+			storeFile file(System.getenv("KEYSTORE"))
+			storePassword System.getenv("KEYSTORE_PASSWORD")
+			keyAlias System.getenv("KEY_ALIAS")
+			keyPassword System.getenv("KEY_PASSWORD")
+		}
+	}
+	buildTypes {
+		release {
+			signingConfig signingConfigs.release
+		}
+	}
 }