Added Gradle Build script.

Ensure Lint checks pass for Gradle build.

build.gradle

@@ -0,0 +1,47 @@
+buildscript {
+    repositories {
+        mavenCentral()
+    }
+
+    dependencies {
+        classpath 'com.android.tools.build:gradle:0.8.+'
+    }
+}
+
+apply plugin: 'android'
+
+repositories {
+    mavenCentral()
+}
+
+android {
+    sourceSets {
+        main {
+            manifest.srcFile 'AndroidManifest.xml'
+            java.srcDirs = ['src']
+            resources.srcDirs = ['src']
+            aidl.srcDirs = ['src']
+            renderscript.srcDirs = ['src']
+            res.srcDirs = ['res']
+            assets.srcDirs = ['assets']
+        }
+
+        instrumentTest.setRoot('tests')
+    }
+
+    buildTypes {
+        release {
+            runProguard true
+            proguardFile getDefaultProguardFile('proguard-android.txt')
+            proguardFile 'proguard-project.txt'
+        }
+    }
+
+    compileSdkVersion 19
+    buildToolsVersion "19.0.1"
+}
+
+dependencies {
+    compile "com.android.support:appcompat-v7:19.0.+"
+    compile files('libs/photoview-1.2.2.jar')
+}

res/values/styles.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
-<resources xmlns:android="http://schemas.android.com/apk/res/android">
+<resources xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools">
 
-    <style name="AppTheme" parent="@style/Theme.AppCompat.Light">
+    <style name="AppTheme" parent="@style/Theme.AppCompat.Light" tools:ignore="NewApi">
         <item name="android:actionBarItemBackground">@drawable/selectable_background</item>
         <item name="actionBarItemBackground">@drawable/selectable_background</item>
         <item name="android:dropDownListViewStyle">@style/DropDownListView.Fosdem</item>

src/be/digitalia/fosdem/activities/MainActivity.java

@@ -300,6 +300,8 @@ public class MainActivity extends ActionBarActivity implements ListView.OnItemCl
 		LocalBroadcastManager.getInstance(this).unregisterReceiver(scheduleRefreshedReceiver);
 	}
 
+	@SuppressLint("NewApi")
+	@Override
 	public boolean onCreateOptionsMenu(Menu menu) {
 		getMenuInflater().inflate(R.menu.main, menu);
 

src/be/digitalia/fosdem/activities/SearchResultActivity.java

@@ -1,5 +1,6 @@
 package be.digitalia.fosdem.activities;
 
+import android.annotation.SuppressLint;
 import android.app.SearchManager;
 import android.content.Context;
 import android.content.Intent;
@@ -94,6 +95,7 @@ public class SearchResultActivity extends ActionBarActivity {
 		}
 	}
 
+	@SuppressLint("NewApi")
 	@Override
 	public boolean onCreateOptionsMenu(Menu menu) {
 		getMenuInflater().inflate(R.menu.search, menu);