Show git clone output

[brunocoelho]

Something weird happens when child_process module tries to manage git's output.
You can reproduce this behavior when trying to fork or create a new repository and clone it.

The last and blank line is supposed to print git's output about the status of the download, something like:

  Cloning into 'dracula-theme'...
  remote: Reusing existing pack: 100848, done.
  remote: Counting objects: 6270, done.
  remote: Compressing objects: 100% (2672/2672), done.
  Receiving objects:  23% (25098/107118), 103.43 MiB | 560.00 KiB/s

It seems that the problem is here.