Fix typo, remove extra spaces and tabs, escaping, and formatting.

* Typo was the word "summary" in the first paragraph of "The Overview Page".
Merge pull request #125 from lukemcdonald/getting-started

Fix typo, remove extra spaces and tabs, escaping, and formatting.
Standardize non-admin submit input class names.

* Give non-admin buttons a class name of "button".
Merge pull request #128 from lukemcdonald/submit-buttons

Standardize non-admin submit input class names.
Fix bug with not being able to unset settings that are of the type multicheck. Closes #122
Add example of the referral URL in settings
Allow affiliates to specify their payment email during registration
Add payment email to dashboard and rename notification settings to profile settings