build.gradle: convert tabs to spaces

android/build.gradle

 buildscript {
-	repositories {
-		mavenCentral()
-	}
-	dependencies {
-		classpath 'com.android.tools.build:gradle:0.5.+'
-	}
+    repositories {
+        mavenCentral()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:0.5.+'
+    }
 }
 
 apply plugin: 'android'
 
 android {
-	buildToolsVersion '18.0'
-	compileSdkVersion 18
+    buildToolsVersion '18.0'
+    compileSdkVersion 18
 
     defaultConfig {
         minSdkVersion 14
         targetSdkVersion 18
     }
 
-	sourceSets {
-		main {
-			manifest.srcFile 'AndroidManifest.xml'
-			java.srcDirs = ['src']
-			res.srcDirs = ['res']
-		}
-	}
+    sourceSets {
+        main {
+            manifest.srcFile 'AndroidManifest.xml'
+            java.srcDirs = ['src']
+            res.srcDirs = ['res']
+        }
+    }
 }
 
 tasks.withType(com.android.build.gradle.tasks.PackageApplication) {
-	pkgTask -> pkgTask.jniDir new File(projectDir, 'libs')
+    pkgTask -> pkgTask.jniDir new File(projectDir, 'libs')
 }