add roadmap override check

[hefangshi]

关联fex-team/fis#299 效果如下

fis.config.merge({
    roadmap: {
        path: [
            {
                reg: '**.css',
                release: '/static/$&'
            },
            {
                reg: '**.js',
                release: '/static/$&'
            }
        ]
    }
});

fis.config.merge({
    roadmap: {
        path: [
            {
                reg: '**.css',
                release: '/static/$&'
            }
        ]
    }
});

fis.config.set('roadmap.path', [
    {
        reg: '**.js',
        release: '/static/$&'
    }
]);

fis.config.set('roadmap', {
    path: [
    {
        reg: '**.js2',
        release: '/static/$&'
    }
]
});

D:\Work\Code\test\override>fis release

 [WARNI] roadmap.path [**.css, **.js] was overrided by [**.css] at D:\Work\Code\
test\override\fis-conf.js:16:12, please use fis.config.get('roadmap.path').unshi
ft(ruler) to add rulers.


 [WARNI] roadmap.path [**.css, **.js] was overrided by [**.js] at D:\Work\Code\t
est\override\fis-conf.js:27:12, please use fis.config.get('roadmap.path').unshif
t(ruler) to add rulers.


 [WARNI] roadmap.path [**.js] was overrided by [**.js2] at D:\Work\Code\test\ove
rride\fis-conf.js:34:12, please use fis.config.get('roadmap.path').unshift(ruler
) to add rulers.

[oxUnd]

这个事情由各自的解决方案负责，内核不做处理。

[2betop]

jello里面确实已用另外一种方式处理了！就是解决方案里面的roadmap在release前才合并进来

[oxUnd]

最好的办法是，用另外一种机制保证，提示终归是下下选。这块再考虑考虑吧。