Workaround Firefox and IE not showing file selection dialog
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Update README.md
Adding check to _endBackgroundTask to verify the application exists before calling GWS_DNOT_REACHED.

This enables what is admittedly a rare scenario which is running these servers inside application-less unit tests where there is no UIApplication.
Merge pull request #105 from nickgravelyn/fix-crash-in-ios-unit-test

Prevent GWS_DNOT_REACHED when there is no application
Added GCDWebServerOption_BindToLocalhost option
Fixed behavior of GCDWebServerOption_BonjourName option