Clarified relationship between telephony services and the user agent (closes #140)
Moved default telephony service into its own section
Changed text about exposing the protocol to be an issue.

See #125
moved TCallControl text to deal with it later
Renamed onservicechanged to ondefaultchanged (closes #100)
Moved activeCall attribute
moved the calls attribute
moved emergencyNumbers attribute
moved serviceIds attribute
Moved defaultServiceId attr and made it nullable (closes #136)
moved changeDefaultService()
Moved the dial method
Moved startTone()
moved stopTone() and sendTones()
Moved steps for incoming call to appropriate section
cleanup
Added landmarks
Merge pull request #143 from marcoscaceres/telephonyManager

Converted Telephony manager to noLegacyStyle (closes #141)