Make TUSafariActivity and ARChromeActivity optional#53

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airdrummingfool wants to merge 1 commit intodfmuir:masterfrom airdrummingfool:activities-optional

+18-7

Commits on Mar 3, 2016

Conditionally importing and using TUSafariActivity and ARChromeActivity, so they are no longer hard project dependencies.
airdrummingfool
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