A couple of minor UX fixes.#5

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pavelfeldman wants to merge 2 commits intoofrobots:v8-inspectorfrom

pavelfeldman:v8_inspector

Commits on May 11, 2016

V8 inspector: provide filenames in the form of URLs to the debugger
pavelfeldman
committed

Commits on May 12, 2016

Wait for debugger to disconnect after app is done.
pavelfeldman
committed