不再有 Unsupported IClasspathEntry kind=4，新的 Checksum 设置
改进错误和警告的设置
Maven 运行时变化： The embedded Maven runtime has been updated to maven 3.2.1. The Netty/AsynHttpClient transport layer as been replaced with OkHttp 1.5.4. OkHttp is now the default HTTP client on the Android platform. It brings HTTP 2.0 and SPDY support to artifact downloads. Please note though, NTLM authentication is not supported. Maven runtime installations can now be customized with a name, and additional libraries can be added. Maven Launch configurations now reference the Maven runtime by name, instead of using a hard-coded location so the configuration is more portable.
See bugs 427932, 418263, 432436
详细介绍请看发行说明：http://tools.jboss.org/blog/2014-07-08-m2e-1_5-improvements.html | 
