Spring Boot 1.4.0.M3发布，新增功能

Spring Boot 1.4.0.M3 发布了，本次发布修复了将近150个问题，以及增加了一些新的功能，具体如下：

• Lots of bug fixes and improvements over M2 (thanks to everyone for trying the milestones).

• Convention based error pages (want a custom 404, just add src/main/resources/public/error/404.html).

• Improved ErrorPage registration support.

• Support for pluggable OAuth2 Principal extraction.

详细文档，可以在这里查看。