bundle install 出现 'gem install mysql2
bundle install 出现 'gem install mysql2 -v '0.3.15' succeeds before bunding ' 解决：sudo apt-get install libmysql-ruby '若找不到这个包试试下面到包 参考：http://packages.ubuntu.com/search?keywords=mysql-ruby ruby-dataobjects-mysql libmysqld
bundle install 出现 'gem install mysql2 -v '0.3.15' succeeds before bunding '
解决：sudo apt-get install libmysql-ruby '若找不到这个包试试下面到包
参考：http://packages.ubuntu.com/search?keywords=mysql-ruby
ruby-dataobjects-mysql
libmysqldb-ruby
ruby-dbd-mysql
sudo apt-get install libmysqlient-dev ' 有时候装好了需要更新（这个是关键）
装好这两个后再bundle install后就成功了。
若在启动rails s的时候报错很多 'require' 或者'block in require'
解决： apt-get install node-js:
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