Matt Perry dff3fa7e46 Support verifying .flx signatures when updating.
Adds a step to the updater to verify that the new .flx package is signed and
untampered.

Each .flx contains a signed manifest file. The manifest contains a SHA-256 hash
of the .flx contents. See bundle.dart for a description of the new .flx format.
2015-10-19 16:39:02 -04:00
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