Added support for Elastic Network Interfaces

[maf23]

The code supports all the documented network interface API calls.
Mockups and unit tests are included.

I have tried to run all unit tests (in mocking mode) and I do get some errors, but I do not think they are related to this patch.

[estonfer]

Sorry for the delay, last week was a bit on the hectic side, I'll try and have this reviewed today.

[maf23]

No problems. I'm running on a local copy anyway since I need this code now,
but do not expect you to roll a new release immediately.

[estonfer]

debug?

[maf23]

Yes, and I thought I had removed all debug code :(

[maf23]

I just updated the pull request. I have removed the 'pp' require. I also ran the tests in mocking mode under ruby 1.8.7 and fixed the problems which turned up.

[estonfer]

looks good, one more thing if it's not too much trouble, could we get an attach test in non-mocking mode? You should be able to just create an instance in the VPC that you created.

Thanks
Eric

[geemus]

@estonfer thanks for taking the lead on this, I didn't feel like I had enough context to cover it.

[estonfer]

@maf23 I modified the tests on a local branch and then pushed it with credit to you. Thanks very much for all the excellet work.

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