CloudApiClient tweaks and more unit tests (up to 85% coverage)

[webbj74]

• CloudApiClient environmentDatabase(s) methods now return Cloud\Response\Database(s) instead of arrays
• Cleaned up some comments in CloudApiClient methods
• Adds several helper functions for building fake data
  • Should split these routines off into a separate class at some point
• Adds unit test coverage for the following CloudApiClient methods:
  • servers
  • server
  • siteDatabases
  • siteDatabase
  • environmentDatabases
  • environmentDatabase
  • databaseBackups
  • databaseBackup
  • createDatabaseBackup
  • taskInfo
• Adds tests to validate the URLs created are correct
  • There is probably a more succinct way of doing this than setting up a separate listener callback for each mock...