Added new metrics "bug_filed" and "bug_resolved"

implements bp metric-bugs

Added new metrics 'bugs' by companies and users
Bugs are retrieved using launchpad-api
Bugs are shown in UI as other metrics as commits, emails, etc.

Change-Id: Ia9d9d8ca2fcbbe0fa257d90585ab1c56403f2419
Merge "Added new metrics "bug_filed" and "bug_resolved""