Add Client.getIdSites()

[the-overengineer]

Add support for getting a list of Tenant's Id Sites, as well as a helper directly on Client, as well as tests for these features.

Usage example:

var stormpath = require('stormpath');

var client = new stormpath.Client();

function doneCallback(err, idSites) {
   if (!err) {
      console.log('Loaded ID sites for tenant');
   }
}

function idSitePrintIterator(idSite, next) {
  console.log('Loaded ID site with href:', idSite.href);
  next();
}

function onGetIdSites(err, idSites) {
  if (err) {
    return console.log('Error:', err);
  }

  idSites.each(idSitePrintIterator, doneCallback);
}

client.getIdSites(onGetIdSites);

Fixes #424

Count not drag the card as I am not a collaborator.

[coveralls]

Coverage increased (+0.04%) to 89.074% when pulling 6aa10fc on feature-client-get-id-sites into 9ac26eb on master.

[coveralls]

Coverage increased (+0.04%) to 89.074% when pulling 6aa10fc on feature-client-get-id-sites into 9ac26eb on master.

[typerandom]

I think this should be getIdSites() instead of getIdSiteModels(). Your reasoning is correct. But the underlying model is named incorrectly so we'll have to fix that in another PR.

#537

[the-overengineer]

Regarding this, I was following a comment in the IdSiteModel class file which references {@link Tenant#getIdSiteModels Tenant.getIdSiteModels()} (which did not exist at the time). Updating this as well.

[typerandom]

Besides my comments this PR is looking good! 👍

[coveralls]

Coverage increased (+0.04%) to 89.074% when pulling 2e56dd5 on feature-client-get-id-sites into 9ac26eb on master.

[typerandom]

@Tweety-FER Awesome. Thank you! I'm happy with the changes. Noticed a small typo in the tests (Tennant -> Tenant). But I fixed that. Going to merge this in.

🎉

[coveralls]

Coverage increased (+0.04%) to 89.074% when pulling 4204769 on feature-client-get-id-sites into 9ac26eb on master.

[robertjd]

I'm pulling this PR and it's issue onto the backlog, as this will be part of 1.0, so I don't want to visualize it on the board right now