Return a structure in postToCollection and putToCollection responses that's a little more consistent with what is returned from POSTAs to /fs.  The structure that is returned looks like:

{
  document: {
    id: <id>,
    path: <path>,
    uploadDate: <uploadDate>
  }
}

which is similar to the response from a POST to fs:

{
  file: {
    id: <id>,
    :
  }
}
Merge pull request #23 from dvazquez1027/ID_in_POST_and_PUT_responses

Return a structure in postToCollection and putToCollection responses tha...