Better Performance for all ESxxx signature algorithms

If the OpenSSL extension supports Elliptic Curves signatures, then it is use.
The result is that the ESxxx algorithms are now approx 40x faster than before.
There is no restriction anymore in the use of those algorithms.

Please note that encryption/decryption algorithms that use EC keys are not affected and therefore not recommended.

Version 4.0.0

This new release is identical to the previous major version but needs PHP5.6.
It also requires PHPECC library v0.4@dev

Version 3.0.1

v3.0.1

Doc updated and methods added

Version 3.0.0

v3.0.0

Minor correction

v2.0.0-beta1

PHPDoc added

v2.0.0-alpha2

Some methods renamed

Version 1.0.0 Beta-1

v1.0.0-beta1

Example added

Version 1.0.0 Alpha 4

This new alpha version removes a useless dependency on Loader object

Version 1.0.0 Alpha 3

Bug fixed: try statement catch JWT checker exceptions.

Version 1.0.0 Alpha 2

This new alpha version only remove useless services injected into Verifier and Loader components