Console and alert 79

Fixes #79.

- Adds proxying for onConfirm/onPrompt events.
- Adds alerts/alerts.js module
- Adds console/console.js module

Adds:
- windowAlerts metric
- windowConfirms metric
- windowPrompts metric
- consoleMessages metric
- Grouped notices for all window.alert, window.confirm, window.prompt, and console.* messages.

Test Urls:

Console reporting: http://www.samsung.com
Alerts: http://www.sjhcockrell/downloads/phantomastest.html