Option to force the use of a cached version

[bsalinas]

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Right now, the task checks whether the cached version of the atom-shell binaries have the correct name and the same size as what is on github. As a workaround for changing the icons of the exe and the name of the app on Mac (some options discussed here), I wanted to edit the icon of the atom.exe using Resource Hacker. I then zipped the cached binary and gave it the same name and wanted my grunt task to use this custom version. Instead it downloaded the latest version from github because the zip file had changed size.

If this feature is something you want in the package, feel free to merge the pull request. If not, don't worry about it.

[tommoor]

:+1: this seems like a solid addition