Add user/show api

* 実行例(JavaScript)

ログイン状態にてChromeコンソールよりRequest:

  var cb = new CallbackInfo(function(res) {console.log(JSON.parse(res));}, this);
  atmos.sendRequest('/atmos/user/show','GET', {user_id: 'bob'}, cb);

Response:

  Object {user_id: "bob", introduction: "てすと?", avator: "images/avator/default_avator.png", groups: Array[0], relationship: Object}

* 失敗例(JavaScript)

user_idが指定されていない場合:

  Status Code: 400
  'user_id' is must be assigned.

指定ユーザーが存在しない場合:

  Status Code: 404
  no user:foo
Merge pull request #36 from haushinka2dx/user-show-api

Add user/show api