Commits on Oct 16, 2016

1. unshare: use by default accountType User …

   Fixes #747.
   
   By default use accountType User, as is done with share,
   so that users can easily do things like
   ```shell
   $ drive unshare -emails [email protected] -id some_id
   ```
   instead of getting back a cryptic error
   ```shell
   no matches found!
   ```
   
   and the common assumptions will work without them
   having to know the entire setup of share and unshare.
   I too found this confusing and had to step back a little
   to figure out that previously the accountTypes were
   never set hence the loop that runs through each file
   never runs.
   
   This change also ensures that if errors were encountered entirely
   errors, without any successful shares/unshares, we won't give back
   the previously cryptic and not useful error of
   ```shell
   no matches found!
   ```

   

   odeke-em committed Oct 16, 2016
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