Bug 912948 part 1.  Add support for [Clamp] and [EnforceRange] on dictionary members.  r=khuey
Bug 912948 part 2.  Add support for [Clamp] and [EnforceRange] on writable attributes.  r=khuey
Bug 914334.  Change codegen to reflect EventListener as a WebIDL callback on workers.  r=khuey
Bug 913670.  Give scripts evaluated via evalInSandbox 1-based line numbers.  r=bholley