Fix verbose curl

Update HttpRequest.php

Remove verbose option

1.5.1: Merge origin/develop into develop

Conflicts:
	composer.json

NGSIv2 Support

• Several changes to compatibilize NGSIV1 and NGSIV2 operations.
• Full support of all operations (in an abstract way)
• new examples code
• PSR-0 compatibility

Orion Context Explorer for PHP Applications

Force String type in subscriptionId

Usualy subscriptions ID should be a string into json object if send it as a integer OrionCB returns a error response.

fixed #2