Add build scripts for travis CI integration

.travis.yml

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+language: objective-c
+osx_image: xcode8
+script: ./scripts/build.sh

scripts/build.sh

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+#!/bin/bash
+
+xcodebuild -project SwiftyStoreKit.xcodeproj -target SwiftyStoreKit
+xcodebuild -project SwiftyStoreKit.xcodeproj -target SwiftyStoreKitOSX
+xcodebuild -project SwiftyStoreKit.xcodeproj -target SwiftyStoreKitTV