Improve typing for translate_cam and add tests#79

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CrashBurnRepeat wants to merge 2 commits intoJuliaGL:masterfrom CrashBurnRepeat:pull-request/70a35720

+37-5

Commits on Nov 7, 2017

Add strict typing to translate_cam and remove Signal type conversion in map call in PerspectiveCamera.
CrashBurnRepeat
committed

Commits on Nov 9, 2017

Revert to previous nested Signal mapping and update input types for translate_cam. Add test to ensure that push!\'ed variables in translate_cam retain their original types.
CrashBurnRepeat
committed