QA updates to the pricing page.

Contains the following fixes:

1. Plan columns aren't centered
2. Pricing plan doesn't know what plan you have
3. Need to capitalize "Sales humans" in confirmation dialog
4. Clicking "get started" on free plans takes ~5 seconds to react
5. FAQ link to optimizely.org
6. Do not pass `null` values through to Marketo
7. No longer redirect during automated test for signed in user, no plan, subscribes to starter