Submitted my Calculator

.gitignore

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+*.iml
+*~
+.DS_Store
+.gradle
+.idea
+.idea/uiDesigner.xml
+.idea/workspace.xml
+/.idea/libraries
+/.idea/workspace.xml
+build
+local.properties
+target

app/build.gradle

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+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 22
+    buildToolsVersion '22.0.1'
+
+    sourceSets {
+      // main.res.srcDir += 'src/main/buttons'
+    }
+
+    defaultConfig {
+        applicationId "reinardcox.c4q.nyc.calculator"
+        minSdkVersion 15
+        targetSdkVersion 22
+        versionCode 1
+        versionName "1.0"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    compile fileTree(dir: 'libs', include: ['*.jar'])
+    compile 'com.android.support:appcompat-v7:22.1.1'
+    compile files('libs/jep-2.23.jar')
+}

app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in C:\Users\Shadow\AppData\Local\Android\sdk/tools/proguard/proguard-android.txt
+# You can edit the include path and order by changing the proguardFiles
+# directive in build.gradle.
+#
+# 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 *;
+#}

app/src/androidTest/java/reinardcox/c4q/nyc/calculator/ApplicationTest.java

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+package reinardcox.c4q.nyc.calculator;
+
+import android.app.Application;
+import android.test.ApplicationTestCase;
+
+/**
+ * <a href="http://d.android.com/tools/testing/testing_android.html">Testing Fundamentals</a>
+ */
+public class ApplicationTest extends ApplicationTestCase<Application> {
+    public ApplicationTest() {
+        super(Application.class);
+    }
+}

app/src/main/AndroidManifest.xml

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+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="reinardcox.c4q.nyc.calculator">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:theme="@style/AppTheme">
+        <!-- Add activity tags -->
+        <activity
+            android:name=".MainActivity"
+            android:label="@string/app_name">
+            <!-- Add the intent filter -->
+            <intent-filter>
+                <!-- Action.Main/Category.Launcher -->
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+</manifest>