* Deploy PRs to branches/ subdir.
* wrong path to util
* added PR number to file name
* check for appveyor pr variable
* also use branches if pushing a branch on windows
* also use branches if pushing a branch on unix
* wrong or operator on powershell
* only decrypt if the key is available
* Use script instead of explicit command
* Don't deploy if the keyfile is missing/empty.
* Don't deploy if key is not available.
* Don't decrypt appveyor key if no secret
* wrong name
* Fix the logic and a typo
