add dashboard ui
Update README.md
refactor the parent child relication, to let executor report to appmaster
Merge branch 'master' of https://github.com/clockfly/gearpump
optimize imports
refactor layout
optimize the imports
fix config
refine the code
Refactor the message passing
refactor the message passing layer.
update copyrights.
Merge pull request #17 from clockfly/master

Refactory: Message passing layer, Application actor hiearachy