handle ssh urls that use home relative paths (ie. paths starting with ~)

[reednj]

It's common for us to have scp style remote urls that use the '~' at the start of the path, to indicate the home directory of the user used at the start of the url. The conversion of these scp style urls to ssh:// urls breaks these paths and adds an initial '/' to the deploy_to path, causing git-deploy not to work.

There is no way (that I know of) to preserve these paths when converting to an ssh:// style uri, so we need to detect this situation and 'correct' the url by removing the initial '/'

[koenpunt]

The ~ is not necessary for scp, because using a relative path means a relative path from the home directory.

So user@host:some/path/to/file is identical to user@host:~/some/path/to/file.

[reednj]

Well, the relative style paths don't work either, but that was harder to fix.

The ~ URLs work fine as remotes in all other situations with git, so it seems right that git deploy should handle it as well