fix bug 834313 - add kpi app with metric model

fix bug 834315 - use metric model to record l10n coverage

clean out un-used files

test for l10n coverage cron job
fix bug 777361 - Keep querystring values when logging in and out
Merge
Merge pull request #844 from darkwing/querystring-login-777361

fix bug 777361 - Keep querystring values when logging in and out
Merge pull request #842 from groovecoder/metric-model-834313

fix bug 834313 - add kpi app with metric model