Better curl error messages for ^6.1 (Spomky-Labs#319)

Better curl error messages for ^6.1
Proposal for issue #316

Apply fixes from StyleCI (Spomky-Labs#315)

[ci skip] [skip ci]

V7.0 (Spomky-Labs#303)

* v7.0

* Doc updated

* Object conflict

* PHPUnit 6

* Apply fixes from StyleCI (Spomky-Labs#302)

[ci skip] [skip ci]

Allow HHVM builds to fail as gmp_random_range isn’t implemented (Spom…

…ky-Labs#294)

* Allow HHVM builds to fail as gmp_random_range isn’t implemented

Tries to create the storage folder

Miniaml RSA Key Test added

Part of the Spomky-Labs#159 PR

EC Key Creator and new AES GCM dep (Spomky-Labs#155)

* GCM algorithms improvements

Native EC Key Generator and AES GCM dependency updated (Spomky-Labs#151)

* AES GCM algs updated and ECKey Generator modified

Private keys from APN support (Spomky-Labs#146)

* Bug fixed and test added
* PKCS#8 key loader added
* Applied fixes from StyleCI

JKU and X5U key sets added (Spomky-Labs#144)

* JKU and X5U key sets added
* Documentation updated