Converted Android_Pebble_SD to use Android Studio (Gradle) build system.

build.gradle

@@ -0,0 +1,18 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+buildscript {
+    repositories {
+        jcenter()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:1.2.3'
+    }
+}
+allprojects {
+    repositories {
+        jcenter()
+    }
+}
+
+
+dependencies {
+}