title: error with p4merge merging tool in git
body: <p>I have setup my classpath for p4merge an set the file .gitconfig, but there i get this error when the p4merge tool suppose to opem those two files that are in conflict. anybody knows the solution?</p>
  
  <p>added to classpath: "C:\Program Files\Perforce\p4merge.exe"
  added to .gitconfig file:</p>
  
  <pre><code>[merge]
      tool = p4merge
  [mergetool "p4merge"]
      cmd = p4merge.exe \\\"$BASE\\\" \\\"$LOCAL\\\" \\\"$REMOTE\\\" \\\"$MERGED\\\"
  </code></pre>
  
  <p>ERROR MESSAGE:</p>
  
  <pre><code>Normal merge conflict for 'protected/views/layouts/main.php':
    {local}: modified file
    {remote}: modified file
  Hit return to start merge resolution tool (p4merge):
  C:\Program Files (x86)\Git/libexec/git-core/mergetools/p4merge: line 8: p4merge:
   command not found
  protected/views/layouts/main.php seems unchanged.
  Was the merge successful? [y/n] n
  merge of protected/views/layouts/main.php failed
  </code></pre>