function context(id) {
    var data = {};
    var requestOptions = {
        path: '/session/:sessionId/context',
        method: 'GET'
    };

    if (typeof id === 'string') {
        requestOptions.method = 'POST';
        data.name = id;
    }

    return this.requestHandler.create(requestOptions, data);
}
Retrieve current context or switch to the specified context

@param {String=} id the context to switch to

@see http://appium.io/slate/en/v1.1.0/?javascript#automating-hybrid-ios-apps
@see https://github.com/admc/wd/blob/master/lib/commands.js#L279
@type mobile
@for android, ios