CRAVEX: Vulnerability exploitability: Cross product queries

[pombredanne]

Query for the affected vulnerable package version presence across multiple products

• create UI
• create API

We should have an API that mimics the UI with /vulnerabilities end point

[DennisClark]

Refer to issue #94 for discussion of model enhancements required to support this feature.

[pombredanne]

This Web UI is now completed, I can navigate across products through vulnerabilities and packages. Starting from vulnerabilities/?sort=-affected_products_count I can drill to products that are affected to packages and navigate back