Make sure EF components are compatible with customizer

[mikaelkaron]

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[mikaelkaron]

From the skype chat:

[10:22:02 AM] Mikael Karon: btw, I just added #42 to remind us that our components should fit into the customizer when we're done
[10:22:37 AM] Mikael Karon: even if we're not going to ever customize, we definently want this to make sure follow best practices
[10:23:12 AM] Mikael Karon: so we may want to spend some time on this from the start. @normanzb , do you mind if I assign this to you?
[10:23:28 AM] Mikael Karon: (It's been targeted for the gamma milestone)
[10:24:30 AM] Vince Liu: Norman is not here, will let he know when he come to office.
[10:25:31 AM] Mikael Karon: I'll just assign it to him ;)