node内存配置（--max-old-space-size）

比较复杂的项目中，angular2编译的时候对CPU和内存需求都会变大。项目中，使用angular-cli@beta28-3编译。需要内存2-3G。node本身，或者说v8本身有一个默认配置:Currently, by default v8 has a memory limit of 512mb on 32-bit systems, and 1gb on 64-bit systems. The limit can be raised by setting –max-old-space-size to a maximum of ~1gb (32-bit) and ~1.7gb (64-bit), but it is recommended that you split your single process into several workers if you are hitting memory limits. 比较复杂的项目中，angular2编译的时候对CPU和内存需求都会变大。项目中，使用angular-