allows loading of icons via http scheme

[boneskull]

• Key NSAppTransportSecurity disallows http by default, and requires https
• Some usable icon resources (loaded via -appIcon or otherwise) are not readily accessible via http

Before:

$ terminal-notifier -t Homebrew -message 'Homebrew upgraded!' -timeout 10 -open file:///tmp/org.boneskull.homebrew-upgrade.log -group org.boneskull.hombrew-upgrade -appIcon http://brew.sh/img/homebrew-256x256.png
2016-10-06 10:43:57.173 terminal-notifier[9174:16746114] App Transport Security has blocked a cleartext HTTP (http://) resource load since it is insecure. Temporary exceptions can be configured via your app's Info.plist file.

After:

$ terminal-notifier -t Homebrew -message 'Homebrew upgraded!' -timeout 10 -open file:///tmp/org.boneskull.homebrew-upgrade.log -group org.boneskull.hombrew-upgrade -appIcon http://brew.sh/img/homebrew-256x256.png -t Homebrew -message 'Homebrew upgraded!' -timeout 10 -open file:///tmp/org.boneskull.homebrew-upgrade.log -group org.boneskull.hombrew-upgrade -appIcon http://brew.sh/img/homebrew-256x256.png

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Caveat: I'm ignorant about what potential problems this could cause otherwise. In my limited testing, the setting NSAllowsArbitraryLoadsInWebContent was insufficient to allow the resource. I didn't try anything else.

Sorry to waste your time if this has been addressed before. I also understand if you think it's not a good idea.

[julienXX]

Thanks! Since terminal-notifier is already not suitable for MAS release, I guess it's okay.