Fix CI test system

[jpschewe]

I loaded Firefox 71 the other day on the Windows test system and now the selenium tests won't work. I tried them on my Linux computer with Firefox 71 and it works just fine. Need to figure this out either with a selenium fix or by going back to another version of Firefox. I believe I has at 65 when it last worked.

[jpschewe]

Older releases of firefox are at https://ftp.mozilla.org/pub/firefox/releases/

[jpschewe]

70 -> failed
69.0.3 -> fail
68.0.2 -> fail
67.0.4 -> fail
66.0.5 -> fail
65.0.2 -> fail

[jpschewe]

I tried the solution at julienvollering/MIAmaxent#1 and it didn't work :(

[jpschewe]

It looks like the problem is that I got a new geckodriver and it requires a visual C++ redistributable. mozilla/geckodriver#1617
Will test with currently installed Firefox 65.0.2 and see if that succeeds. If it does, upgrade to the latest and see that succeeds as well.

[jpschewe]

Running with Firefox 71.0 now

[jpschewe]

Works with Firefox 71.