revise the timeout of nw-in-mem test
[manual testcase] Added manual test for issue #72
Merge pull request #1038 from richardcypher/nwinmem

[test]revise the timeout of nw-in-mem test
Fix showDevTools argument handling for dev jail

the bug is: clicking the gears button doesn't clear the
cached jail target
Merge pull request #1040 from alex-ter/nw-manual-test-#72

[manual testcase] Added manual test for issue #72
bump version to 0.7.3-pre