Change mout dependency to be less restrictive

[mpj]

Very helpful when deduping.

[coveralls]

Coverage remained the same when pulling c90866f on mpj:patch-1 into f0fe4c7 on kamicane:master.

[jdalton]

Mout is still not v1.0 and introduces breaking changes from release to release. If anything, because it's pre-1.0 you should be more restrictive.

[kentaromiura]

I agree with @jdalton, a "compatible with 0.9" is not a good idea for the reason he has state, also because the "compatible with" is only working on node post >= 0.10 and iirc prime still works fine on previous version of node.
This change will make prime incompatible with 0.8 for no apparent reason.

[GCheung55]

prime is 0.4.x right now. I think it can afford to have breaking changes. That said, it can be more restrictive and test against moutjs@0.10 before updating.

This change will make it incompatible with node.js@0.8 because of the semver ^ correct?

[kentaromiura]

Yep