Hotfix/ssl 1.4.2

Thin patch needs to apply to the 1.4.2 tag (`1.4.3`+ is currently broken as mentioned in https://github.com/paypal/merchant-sdk-php/issues/68). I guess we can tag this as `1.4.2.2`.

Do not merge into `stable-php5.3` despite the description. We only need https://github.com/thoaionline/sdk-core-php/commit/244abbedaf29f82dd60aef5879065edb15f85a59 applied to `1.4.2`.