embed manifest to apply visual style for tooltip

Fix #72 #810
call devtools jail setter only when node is enabled

or there would be reports that 'require()' is not defined
when opening devtools. Fix #809
[test] fix path for snapshot case on Mac
[Mac] show the window without the focus side effect

Fix #497

This fix also brings the window to front when launch from terminal
[Mac] adding comments for the previous commit
include autofill msgs in IPC logging
[test] automatic test case for console.log
[test] fix test case for console.log
New app finding on startup; Fix #843

nw will search for app as proposed in #843:

1. search in the end of executable
2. search for manifest in the same directory with executable
3. search for 'package.nw' in the same directory with executable
4. search in the first argument for app
bump version to 0.6.2
Fix 8247d63 for Win
[README] update for 0.6.2
Merge pull request #849 from kingFighter/tests

[test] automatic test case for console.log