在composer update项目的时候，报了如标题一样的错误，当然这个错误 有一大堆

composer update
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

Problem 1
- The requested package bower-asset/jquery could not be found in any version, there may be a typo in the package name.
Problem 2
- Installation request for yiisoft/yii2 dev-master -> satisfiable by yiisoft/yii2[dev-master].
- yiisoft/yii2 dev-master requires bower-asset/jquery 2.1.*@stable | 1.11.*@stable -> no matching package found.
Problem 3
- yiisoft/yii2 2.0.x-dev requires bower-asset/jquery 2.1.*@stable | 1.11.*@stable -> no matching package found.
- yiisoft/yii2 dev-master requires bower-asset/jquery 2.1.*@stable | 1.11.*@stable -> no matching package found.
- Removal request for yiisoft/yii2-imagine == 2.0.9999999.9999999-dev
- yiisoft/yii2-imagine 2.0.0 requires yiisoft/yii2 * -> satisfiable by yiisoft/yii2[dev-master, 2.0.x-dev].
- yiisoft/yii2-imagine 2.0.0-rc requires yiisoft/yii2 * -> satisfiable by yiisoft/yii2[dev-master, 2.0.x-dev].
- yiisoft/yii2-imagine 2.0.1 requires yiisoft/yii2 * -> satisfiable by yiisoft/yii2[dev-master, 2.0.x-dev].
- yiisoft/yii2-imagine 2.0.2 requires yiisoft/yii2 * -> satisfiable by yiisoft/yii2[dev-master, 2.0.x-dev].
- Removal request for yiisoft/yii2-imagine == 9999999-dev
- Installation request for yiisoft/yii2-imagine * -> satisfiable by yiisoft/yii2-imagine[2.0.0, 2.0.0-rc, 2.0.1, 2.0.2, 2.0.x-dev, dev-master].

Potential causes:
- A typo in the package name
- The package is not available in a stable-enough version according to your minimum-stability setting
see <https://groups.google.com/d/topic/composer-dev/_g3ASeIFlrc/discussion> for more details.

Read <http://getcomposer.org/doc/articles/troubleshooting.md> for further common problems.
看上去好纠结，但其实官方有过提示，通过查看：http://www.yiiframework.com/doc-2.0/guide-start-installation.html#installing-via-composer，可知，只要运行： 
composer global require "fxp/composer-asset-plugin:1.0.0"
问题解决。
composer update
Loading composer repositories with package information
Updating dependencies (including require-dev)
Reading bower.json of bower-asset/jquery.inputmask (3.1.47)
Could not fetch https://api.github.com/repos/RobinHerbots/jquery.inputmask/contents/bower.json?ref=9ff37e85bc2fa2350475c4a7fa60aa20cd211481, enter your GitHub credentials to go over the API rate limit
The credentials will be swapped for an OAuth token stored in /Users/*******/.composer/auth.json, your password will not be stored
To revoke access to this token you can visit https://github.com/settings/applications
Username:********
Password:********
Token successfully created
Reading bower.json of bower-asset/jquery.inputmask (3.1.44)
。。。。。。。此处省略500字