Eventloop future

[calebkleveter]

Adds the EventLoopGroup.future methods from vapor/core.

Checklist

• [x] Circle CI is passing (code compiles and passes tests).
• [x] There are no breaking changes to public API.
• [x] New test cases have been added where appropriate.
• [x] All new code has been commented with doc blocks ///.
• [x] The linuxMain.swift is regenerated using swift test --generate-linuxmain

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