add tab expansion for git cherry
Store SSH environment info in %TEMP%\.ssh

[EnvironmentVariableTarget]::User is painfully slow, because it notifies other processes of the changed value.

Closes #88
Export Get-SshPath [-File <file>]

Pretty sure GH4W has logic similar to this...might as well share.
File defaults to id_rsa.
Merge branch 'master' into viper