Abolish common and misc directories

src/user/get-acct.ts

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+export default user => {
+	return user.host === null ? user.username : `${user.username}@${user.host}`;
+};

src/user/get-summary.ts

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+import { IUser, isLocalUser } from '../models/user';
+import getAcct from './get-acct';
+
+/**
+ * ユーザーを表す文字列を取得します。
+ * @param user ユーザー
+ */
+export default function(user: IUser): string {
+	let string = `${user.name} (@${getAcct(user)})\n` +
+		`${user.postsCount}投稿、${user.followingCount}フォロー、${user.followersCount}フォロワー\n`;
+
+	if (isLocalUser(user)) {
+		const account = user.account;
+		string += `場所: ${account.profile.location}、誕生日: ${account.profile.birthday}\n`;
+	}
+
+	return string + `「${user.description}」`;
+}

src/user/parse-acct.ts

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+export default acct => {
+	const splitted = acct.split('@', 2);
+	return { username: splitted[0], host: splitted[1] || null };
+};