Supplier ratings - System calculates and displays summary/average for each rating item

[fcarreno]

As a user I want to see a summary of ratings associated to each service supplier, so as I can make a better decision on who to contact to request a service

Acceptance criteria:

• The application should calculate an average for each rating item (those that can be set from 1 to 5 Stars) based on ratings/reviews added by users (see #8), and display the appropriate value (again, from 1 to 5 Stars).
• Need to define how we'll reflect the average, if it's not an integer value (can we highlight half of a Star?), and how we'll apply rounding. E.g.: do we consider 3.7 = 4 or = 3.5? Look for flexible options where we can highlight parts of a Star, and - possibly - provide a tool-tip text or some kind of indicator stating the actual average value. It seems to be technically possible to display half of a Star: http://bootstrap.snipplicious.com/snippet/1/star-rating-with-half-stars http://stackoverflow.com/questions/30956488/create-a-decimal-star-rating-for-a-comment-in-angularjs http://wbotelhos.com/raty
• The application should display the summary/average for each rating item on the service supplier details view (see #7).

Note: if we consider adding it to the list of service suppliers matching the user's search criteria as well (see #4), we may end up overloading the results view with too much info, so think about how to make it accessible from the list, but without having to explicitly access the service supplier details view...(maybe a small popup / modal / panel). Same applies for the display of jobs ( #30), and likes / shares ( #38)

Maybe one option is to display just the overall category (see #9) on the list of service suppliers matching the user's criteria, and - on mouse over / click - we display a small panel with details of items contributing to that category calculation (the very averages from this story + the jobs total count (#30) + likes / shares (#38))