Merge pull request #117 from KKBOX/master_wendy

Customize retry time
Correct notify to minus working count on really cancel
Merge pull request #124 from KKBOX/master_daniel

Correct notify to minus working count on really cancel
Refactory code to check null listener situation
Merge pull request #125 from KKBOX/master_daniel

Refactory code to check null listener situation
Correct http GET parameters logic to avoid redundant qualifier
Refactory code
Merge pull request #127 from KKBOX/master_daniel

Correct http GET parameters logic to avoid redundant qualifier
ticket.82532: Add log for KKEventQueue