added L1/L2, R1/R2, Start, and Select buttons to on-screen controls

Limelight/Images.xcassets/L1.imageset/Contents.json

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+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "scale" : "1x",
+      "filename" : "L1-1.png"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "2x",
+      "filename" : "L1.png"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x",
+      "filename" : "L1-2.png"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

Limelight/Images.xcassets/L2.imageset/Contents.json

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+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "scale" : "1x",
+      "filename" : "L2.png"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "2x",
+      "filename" : "L2-1.png"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x",
+      "filename" : "L2-2.png"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

Limelight/Images.xcassets/R1.imageset/Contents.json

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+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "scale" : "1x",
+      "filename" : "R1.png"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "2x",
+      "filename" : "R1-1.png"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x",
+      "filename" : "R1-2.png"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

Limelight/Images.xcassets/R2.imageset/Contents.json

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+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "scale" : "1x",
+      "filename" : "R2-1.png"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "2x",
+      "filename" : "R2.png"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x",
+      "filename" : "R2-2.png"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

Limelight/Images.xcassets/SelectButton.imageset/Contents.json

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+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "scale" : "1x",
+      "filename" : "select_button-1.png"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "2x",
+      "filename" : "select_button.png"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x",
+      "filename" : "select_button-2.png"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

Limelight/Images.xcassets/StartButton.imageset/Contents.json

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+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "scale" : "1x",
+      "filename" : "start_button-1.png"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "2x",
+      "filename" : "start_button.png"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x",
+      "filename" : "start_button-2.png"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}