Added limit to the options

Allows you to limit the number of rows returned, defaults to 0 (which is
unlimited)
Bug fix and added option to only retrieve torrents with 100% completion
Merge remote-tracking branch 'samuel/master_single_file' into master_single_file_merge

* samuel/master_single_file:
  Bug fix and added option to only retrieve torrents with 100% completion
  Added limit to the options

Conflicts:
	utorrentctl.py