title: rbt setup-repo returns with error
body: <p>I am using git as my code repository. While trying to setup the review board server form git cmd line rbt returns with the below error:</p>
  
  <p><strong>ERROR: Could not load SCM Client "git": [Error 2] The system cannot find the file specified
  ERROR: The current directory does not contain a checkout from a supported source code repository.</strong></p>
  
  <p>I have some files modified on the client.</p>
  
  <p>I am new to git, so I am not sure if its to do with some error in git installation or not. Although my git commands are all working fine.</p>
  
  <p>rbt version is 0.7.3
  Any pointers what is going wrong here?
  Thanks in advance.</p>