Introduce ApplicationConfiguration which holds all the config xmls (AppEngineWebXml, CapedwarfConfiguration, IndexesXml, etc.)
CAPEDWARF-213 Implement inbound mail service
Inbound mail parameters should all be required
Added new config parameters to inbound mail:  protocol and pollingInterval
Remove global AppConfig key.
Count AppIdFactory usage.
Add mail parsing test.
[CAPEDWARF-223]; handle roles.