Add ListSubOperationTestCase
Add ListArticleTranslations operation
Add ListCaseReplies operation
Add ListCaseNotes operation
Add ListCompanyCustomers operation
Add ListCustomerCases operation
Add ListFilterCases operation
Add ListGroupFiters operation
Add ListGroupUsers operation
Add ListMacroActions operation
Add ListTopicArticles operation
Add ListTopicTranslations operation
Merge pull request #16 from bradfeehan/operations/sub-list

Sub-List operations
Fixes #4.