Update reviewers command and its output format:

- Updated the reviewers command to look for the current directories tree in order to find the list of maintainers
- The output shows the ``filename`` and its ``reviewers`` in the same line

<pre>
[09:55:03 AM]% pulls reviewers 4114                                                            
docs/sources/examples/running_ssh_service.Dockerfile   metalivedev, jamtur01, SvenDowideit,
docs/sources/examples/running_ssh_service.rst          metalivedev, jamtur01, SvenDowideit,

[09:55:11 AM]% pulls reviewers 48                                                             
container.go        shykes, creack, vieux, crosbymichael, tianon, vieux, tianon, tianon, unclejack,
container_test.go   shykes, creack, vieux, crosbymichael, tianon, vieux, tianon, tianon, unclejack,
lxc_template.go     shykes, creack, vieux, crosbymichael, tianon, vieux, tianon, tianon, unclejack,
rcli/http.go
rcli/tcp.go
rcli/types.go
server/server.go
</pre>

Closes #69
Closes #61