Switch all component build to rollup

[bigopon]

With #147 in place, and incoming new way to register global resources via aurelia/framework#858 , it's now possible to distribute every ux package in a single file., and it's more desirable to to do, for build pref, runtime startup perf, size reasons.

Rollup is a good bundler for this, and it will also make the build setup very simple.

Thoughts ? @ZHollingshead @EisenbergEffect

[serifine]

I like the idea of this. Is this one file overall per component or one file per format? (i.e. one for AMD, one for CommonJS, one for system)

[bigopon]

it will be one file overall per module type (amd, commonjs ...) , like what we did with core.

[serifine]

Alright, I think this will be fine then. We should have the packages and core synced up anyways as far as the build method.

[EisenbergEffect]

@bigopon This can be closed right?

[bigopon]

Yes, Rollup, while gives a lot of benefits related to distribution, limits the consumption of a component library that distributes custom element (ex: CSS autoprefixing).
Closing this as we went for the middle way.