accurator/commit

Added random strategy, ranking based on number of users that annotated.

 api/accurator.pl                                |  2 ++
 lib/accurator/annotation.pl                     | 14 ++++++++++++++
 lib/accurator/recommendation/strategy_random.pl | 23 +++++++++++++++++++++++
 3 files changed, 37 insertions(+), 2 deletions(-)