Add clickable commit link

[ylecuyer]

Fixes #1118

This PR adds a new config commitLink to the .ungitrc of the form:

{
  "bugtracking": true,
  "sendUsageStatistics": true,
  "socketId": 1,
  "linkToCommit": {
    "/home/ylecuyer/Projects/ungit": "https://github.com/FredrikNoren/ungit/commit/%H"
  }
}

%h and %H are used respectively for short sha1 hash and sha1 hash (as in git format)

If this config is not set the behaviour of ungit doesn't change otherwise the sha1 of the commit component is clickable and link to the interpolated url.

I have an issue with the commit component because links (mailto included) are no clickable and I haven't figured out why.

Todos:

• implementation
• test
• update changelog
• see why links inside commit components are not clickable
• add doc to README

[jung-kim]

So we should need to do this, we could just extract from the remote repo location right?

from there we can derive the url path

[ylecuyer]

No we can't, one repo may have many remotes (ie. one for github and one for heroku) so we can't decide which one win over the other. And some remotes can be privates (ie. git.example.com) and we can't derive the url path

[jung-kim]

Oh yea, you are absolutely right. but I bet most repos have single remote and conjunction with this map override method, it would be much better user experience

[jung-kim]

Click operation is being hijacked for in other components for handling node click and node unclicks. You would have to touch up on CommitViewModel.prototype.stopClickPropagation()