Call Focus and Blur only for devtools

Fix #1387
Merge pull request #1388 from kingFighter/tests

[test] temp dir should be removed after app exits
[WIN] Handle WM_SIZE in maximize case

Fix #753
[OSX] Free Window object when closing CDT

Fix #1391
[test] test case for fast open&close devtools from #1391
bump version to 0.8.3
Merge pull request #1398 from kingFighter/tests

[test] update test case for building native modules(node-dtrace-provider...
[README] update for 0.8.3
Merge pull request #1408 from kingFighter/test_#1391

[test] test case for fast open&close devtools from #1391
Add a 'quit' parameter to 'close' event cb

On OSX, when user hit 'Cmd-Q', the close event is
sent with a 'quit' parameter to distinguish with
other cases for closing window

Fix #430
bump version to 0.8.4
[README] update for 0.8.4