Create a listener for the end hook
Cleaned up some logging
Merge branch 'master' into benchan/singular_call_hook

Conflicts:
	applications/callflow/src/cf_exe.erl
	applications/callflow/src/cf_singular_call_hooks.erl
Fixed unresolved conflict lines
Cleaned up file
Added bridgeID into json, fixed bug, ran dialyzer
Fix some comments
Address concerns in review of pull request
Call ID should have a capital D
Fix Id to ID
Fix Id to ID
Merge pull request #274 from Sendhub/benchan/singular_call_hook

Singular call hook via cf_exe add_listener