compute: implement InstanceGroups

[stephenplusplus]

RE: #1073

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This adds support for instance groups:

var gce = gcloud.compute();
var zone = gce.zone('us-central1-a');

// Get all of the instance groups in the project (also available in stream mode)
gce.getInstanceGroups(function(err, instanceGroups) {});

// Get all of the instance groups in a zone (also available in stream mode)
zone.getInstanceGroups(function(err, instanceGroups) {});

// Reference an existing instance group
var instanceGroup = zone.instanceGroup('instance-group-name');

// Add VMs to an instance group (1 or more)
instanceGroup.add([
  zone.vm('my-vm'),
  zone.vm('my-other-vm')
], function(err, operation, apiResponse) {});

// Remove them (1 or more)
instanceGroup.remove(zone.vm('my-vm'), function(err, operation, apiResponse) {});

// Get the VMs from the group (also available in stream mode)
instanceGroup.getVms(function(err, vms) {});

[stephenplusplus]

@callmehiphop I originally had the type called Group, then felt that was a little short, so I expanded it to InstanceGroup -- which would you prefer?

[callmehiphop]

I like InstanceGroup!
On May 17, 2016 11:13 AM, "Stephen Sawchuk" [email protected]
wrote:

@callmehiphop https://github.com/callmehiphop I originally had the type
called Group, then felt that was a little short, so I expanded it to
InstanceGroup -- which would you prefer?

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#1320 (comment)

[coveralls]

Coverage remained the same at 100.0% when pulling 8ec4b35 on stephenplusplus:spp--1073-instance-groups into 17e510b on GoogleCloudPlatform:master.

[stephenplusplus]

@callmehiphop Ready for a review, good sir.

[stephenplusplus]

@callmehiphop Done!

[coveralls]

Coverage remained the same at 100.0% when pulling 1be1df5 on stephenplusplus:spp--1073-instance-groups into b877420 on GoogleCloudPlatform:master.

[stephenplusplus]

@callmehiphop looks mergable to you?

[callmehiphop]

@stephenplusplus yeah, sorry, looks good!