Merge pull request #19 from php-fig/revision

Update for simplified approach

Tweak README.

Merge pull request #18 from php-fig/no-error-event

Remove ErrorEventInterface.

Merge pull request #14 from php-fig/renamespace

Condense namespace.

Merge pull request #13 from php-fig/errors

Add interface for error handling.

Merge pull request #13 from php-fig/errors

Add interface for error handling.

Merge pull request #12 from php-fig/naming-things-correctly

Fix inheritance.

Merge pull request #7 from php-fig/take1

Take1