Rename getVersions() to getFieldVersions(). Add getItemVersions() to retrieve the versions of an item as a whole instead of only a single field. Alias getVersions() to both depending on if  is passed
Forgot to add getColumnVersions alias
Merge pull request #50 from nesl247/item_versions

Rename getVersions() to getFieldVersions(). Add getItemVersions() to ret...