安装 SPRING TOOL SUITE
SPRING TOOL SUITE 是一个 Eclipse 插件，利用该插件可以更方便的在 Eclipse 平台上开发基于 Spring 的应用。
安装方法说明（springsource-tool-suite-3.4.0.RELEASE-e4.3.1-updatesite.zip）：
Help --> Install New Software...
Click Add...
In dialog Add Site dialog, click Archive...
Navigate to springsource-tool-suite-3.4.0.RELEASE-e4.3.1-updatesite.zip and click Open
Clicking OK in the Add Site dialog will bring you back to the dialog 'Install'
Select the xxx/Spring IDE that has appeared
Click Next and then Finish
Approve the license
Restart eclipse when that is asked
