[Delivers #43555805 #43555663] Get Account functionality, tests coverage

https://www.pivotaltracker.com/story/show/43555805
https://www.pivotaltracker.com/story/show/43555663

## Changes

* Added the Account GET ACCOUNT Functionality for Monitoring

* Added all Objects

* Added Metadata Key object

## TESTING

* End to end testing with the API calls and created 2 intergration tests to compare output

### References

http://docs.rackspace.com/cm/api/v1.0/cm-devguide/content/service-account.html#d444e1296

http://docs.rackspace.com/cm/api/v1.0/cm-devguide/content/overview.html

```
{
    "id": "ac7SzakhPj",
    "metadata": {},
    "webhook_token": "qq4KBwlXbJvxERwTg9nNtudRcGidAABY"
}
```