Update gems

I have updated the gems in order to fetch the bug fix I have submitted
for the tire project which got merged upstream.

Signed-off-by: Konrad Reiche <konrad.reiche@gmail.com>
Convert metadata result set to hash

For a better abstraction I am converting now the result of the method
responsible for returning all metadata into an array of hashes.

Signed-off-by: Konrad Reiche <konrad.reiche@gmail.com>
Add to_hash to best and worst record methods

Similar to the previous commit I have added the to_hash conversion to
the methods for retrieving the best and worst record with respect to a
certain metric.

Signed-off-by: Konrad Reiche <konrad.reiche@gmail.com>
Implement richness of information detail view

I have added a detail view for the richness of information metric in
order to display the different fields which were used to compute the
score. The first results seemed to reveal a general flaw in my
implementation or the metric itself which needs to be fixed.

Signed-off-by: Konrad Reiche <konrad.reiche@gmail.com>