Updated Windows and OS X documentation.
[ci skip]
Merge pull request #2857 from edgy360/master

Update Windows and OS X documentation
prelaunch fix
Merge pull request #2859 from sebv/prelaunch-fix

Prelaunch fix
execute test fix
reducing safari flakiness/ fixing safari tests
Merge pull request #2860 from sebv/fixes

Fixes
code cleanup
upgrading appium-uiauto
upgrading appium-uiauto
upgrading appium-uiauto