Fixes #179 -- expand ~'s in the path to a key file
Added a test and fixed a typo
Added a second test for the other form of tilde paths
Merge branch 'master' into expand-user-path
Replace implementation with Mitchell's go-homedir
Remove extraneous trailing bit in the import URL
Merge pull request #182 from alex/expand-user-path

helper/ssh: expand ~'s in the path to a key file