Add a linter rule to detect variable arguments for `break` and `continue`

Summary: In PHP 5.4, the `break` and `continue` statements no longer accept variable arguments (e.g., `break 1 + foo() * $bar;`). Static arguments still work, such as break 2;. As a side effect of this change `break 0;` and `continue 0;` are no longer allowed.

Test Plan: Added some test cases.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D10567