Updates for the new debugger server API#7

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past wants to merge 4 commits intofirebug:masterfrom past:master

+18-83

Commits on May 11, 2012

Use the new extension API from bug 753401:
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Commits on Jun 28, 2012

Merge branch 'master' into firebug
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Commits on Aug 6, 2012

Update to the latest debugger server API changes (bug 753401).
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Commits on Aug 9, 2012

Update the debugger server initialization code to account for bug 781515
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