Add returns summary

Add returns summary for salt cmd, Example:
<pre>
# salt '*' test.ping
salt-minion-02.example.com:
    True


-------------------------------------------
Summary
-------------------------------------------
Recived returns counter: 1
-------------------------------------------
</pre>

verbose:
<pre>
# salt '*' test.ping -v
Executing job with jid 20140429084534201775
-------------------------------------------

salt-minion-02.example.com:
    True
salt-minion-01.example.com:
    Minion did not return


-------------------------------------------
Summary
-------------------------------------------
Target minions counter: 2
Recived returns counter: 1
Not returns counter: 1
Not return minions: salt-minion-01.example.com
-------------------------------------------
</pre>