relation to allow batch creation in 3.x

### Bug or feature request



- [x] Bug
- [ ] Feature request

### Description of feature (or steps to reproduce if bug)
https://github.com/strongloop/loopback/pull/2879 it didnt handle batchCreate for relations,
so in a scenario where `POST /book/:id/page` it will not inherit `allowArray` flag and therefore will not allowArray in 3.x's more strict coercion 

related code 
https://github.com/strongloop/loopback/blob/6b6ca95e2d8d6bb0f0ddeaa66b14abca83ec47f0/lib/model.js#L499-L506

cc @bajtos 


**Update 18/11/16**:
  - @pthieu and @strongloop/squad-epitome needs to review https://github.com/strongloop/loopback/issues/2947, and https://github.com/strongloop/loopback-sdk-angular/issues/253 is blocked by this issue.

**Update 22/11/16**:
  - Functionality was changed from last week, needs review.

**Update 23/11/16**:
  - Still needs review.

	define('__create__' + relationName, {
	isStatic: false,
	http: { verb: 'post', path: '/' + pathName },
	accepts: { arg: 'data', type: 'object', model: toModelName, http: { source: 'body' }},
	description: format('Creates a new instance in %s of this model.', relationName),
	accessType: 'WRITE',
	returns: { arg: 'data', type: toModelName, root: true },
	});

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relation to allow batch creation in 3.x #2928

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relation to allow batch creation in 3.x #2928

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