Expose updateQuery

[joarwilk]

Connected to apollographql/apollo-client#506

[apollo-cla]

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[jbaxleyiii]

@joarwilk thanks for this! Could you add a usage test as well?

[joarwilk]

@jbaxleyiii Done. Do note it breaks. The updateQuery method was supposed to be a part of apollo client 0.4.11 but it didn't make it somehow. This can't be merged until the next client release.

I'm not sure how you guys handle breaking changes but I guess this would have to wait until the next minor (?) react-apollo version goes out since it depends on a newer client version.

[jbaxleyiii]

@joarwilk could you rebase this? I'd love to get it merged and out for release!

[jbaxleyiii]

I pulled this into #152 so I could go ahead and release it!