Unify results rendering

[achilleas-k]

The results rendering functions (renderBidsResults() and renderNIXResults()) still duplicate a lot of code that could be moved to the Results() function. We could shrink these two functions so that :

• Make the main Results() function parse the layout template.
• The Results() function could also parse the template for each validator and then we can make the renderBidsResults() and renderNIXResults() functions simply return an interface{} which contains the data required to execute the template.

We could go one step further and have a single template for all validation results. Each function would then have to return a byte slice of their results as text instead of having them structured. The template would then simply add the text to the body of the common template.