Rename Foo exceptions to FooException, fixes T270

Test Plan:
```
git grep -Pi '(catch|throw).*(Parser|Validator|Formatter|Authenticator)' -- application/ src/
```

Verify that all references are `FooException`.

Reviewers: eyedol, rjmackay

Reviewed By: rjmackay

Subscribers: dkobia

Maniphest Tasks: T270

Differential Revision: https://phabricator.ushahidi.com/D116