centos下安装pip
在centos上默认安装了python2.x ， 对应的pip并没有安装，这里简单做下安装的过程：
wget https://bootstrap.pypa.io/get-pip.py sudo python get-pip.py
对于pycharm的激活信息：
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使用前请将“0.0.0.0 account.jetbrains.com”添加到hosts文件中
0.0.0.0 account.jetbrains.com
参见：http://idea.lanyus.com/
