mup doesn't work with relative pem paths

[reduxdj]

I had to change this from:
pem: '~/.ssh/id_rsa'

pem: '/Users/Patrick_/.ssh/id_rsa'

because of this result: open '/Users/Patrick_/app/~/.ssh/id_rsa'

[madushan1000]

We use nodejs path module to resolve relative paths, and it doesn't support ~(~ is not a unix standard, It's just used by bash originated shells). Take a look at these two issues in nodejs nodejs/node-v0.x-archive#2857 nodejs/node#684. If someone can add this to mup using a third party library, pull requests are welcome.

PS: Mup works with relative paths like ../../yourkey fine.

[Ben305]

Can be solved easily:

var path = require('path');
var os = require('os');
var privateKey = path.join(os.homedir(), '.ssh', 'id_rsa');

and then later with
pem: privateKey