Add easy-to-use binary

Summary: This diff makes Commands:
  ard help [COMMAND]  # Describe available commands or one specific command
  ard pr TARGET       # Open a pull request against the target branch (master by default) a binary, so that you can simply say

D, [2014-08-08T16:56:45.630883 #89000] DEBUG -- : git log target..HEAD --oneline: 
	
D, [2014-08-08T16:56:45.634886 #89000] DEBUG -- : git rev-parse --abbrev-ref HEAD: binarify

rather than



and also use it in other projects.

Test Plan: dogfoodz

Reviewers:

    @barooo plz
    @gnarmis plz
    @kairuiwang plz
    @kochalex plz
    @lshepard plz
    @mpstreeter plz
    @nhatch plz
    @spo11 plz
    @khsia plz