Rename fetch_all_flolders to FindFolders()
Support new operation DeleteFolder
Adding item types for Exchange items
TotalCount should be parsed as int
Misc chagnges to soap.py

- new helper functions to parse xml responses
- send nw throws a custom exception on connectiorn errors
- misc. fixes
add new namespace to default request xml, new find_item template
Fetch and parse contacts from Exchange through EWS

- implement service.FindItems for a given folder
- Parse resulting response and parse into a contact object