[README] update for 0.7.1
[test] update test case for single instance with open method in Mac
Merge pull request #1009 from kingFighter/single-instance

[test] update test case for single instance with open method in Mac
bump version to 0.7.2-pre
fix bugs of useragentapp and pathescape test cases
[test] test case for #486: Application Crash when quitting with secondary window on top
Merge pull request #1010 from richardcypher/appescape

[test]fix bugs of useragentapp and pathescape test cases
Merge pull request #1011 from kingFighter/test-case-#486

[test] test case for #486: Application Crash when quitting with secondary window on top
fix the bug of appescaping about window not closing
make pointers to shell weak
check ptr to shell in platform event handlers
Fix 984: delete shell obj asap in force close case
support passing frame element to Window.showDevToolsJail()
add test case for #984
[manual testcase] Added test for issue #434
Merge pull request #1020 from richardcypher/nwinmem

[test]add case for #984
Merge pull request #1022 from alex-ter/nw-manual-test-#434

[manual testcase] Added test for issue #434
disable writing to debug.log by default

Fix #1031
bump version to 0.7.2