在STS中点击Spring Template Project 时无法得到模板报错信息如下：
Error while downloading or parsing descriptors file 'https://raw.github.com/SpringSource/spring-integration-templates/master/si-sts-templates/builds/descriptor.xml':
org.eclipse.core.runtime.CoreException: Error while retrieving https://raw.github.com/SpringSource/spring-integration-templates/master/si-sts-templates/builds/descriptor.xml
解决方法如下图：
