Implemented personId for EsValidation

[elboletaire]

As said in #117 we have more than one personId type. For that reason I've created three methods (a part from the personId itself):

• dni: checks personId's of type dni. These are the common personIds.
• nif: checks personId's of type nif. These begin with K, L or M.
• nie: checks personId's of type nie. These begin with X, Y or Z.

For this reason, I've implemented personId to check all them by default, but you can specify which types you wanna check with its second parameter:

EsValidation::personId('whatever'); // checks all types.
EsValidation::personId('whatever', ['dni']); // only checks dni type.
EsValidation::dni('whatever'); // same as above, but using its proper method.
EsValidation::personId('whatever', ['dni', 'nif']); // only checks dni and nif types.

[elboletaire]

I'm currently fixing the constant issue. At first I thought it was due to the array shortcuts but later I've seen it's due to the usage of the constant as an array, which is not supported until php 5.6.

[elboletaire]

I forgot that there's an interface which specifies how the personId method should be. So, I've removed the optional param and now personId checks for any valid NIF type.

[elboletaire]

No comments about this @dereuromark @antograssiot ??

[dereuromark]

Looks good apart from my comments about more strictness.

[elboletaire]

Thanks for the revision @dereuromark. I'll do the fixes when I can.

[elboletaire]

Changes done :smile: