Added phpinfo() page to the SettingsModule.

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | --
| Fixed tickets | --
| License       | MIT
| Doc PR        | --

The page looks like so:
![image](https://f.cloud.github.com/assets/2145092/1035379/ce76828e-0f29-11e3-8fa4-248be7701734.png)