Revert "Add name of copyright owner in LICENSE"

This reverts commit f947bcbc2f8360ac567106b6328eb5e6ee6100b3.
Add copyright and license into source code
Upgrade Gradle plugin for Android to 0.12
Mod README.md

- Travis CIのバッジを追加
- 連載タイトルを表記
- 記事へのリンクを追加