Fix exceptions classes (#81)

* Use InvalidArgumentException when $allowed_algs is not array

> Exception thrown if an argument is not of the expected type.
http://php.net/manual/en/class.invalidargumentexception.php

* Use RuntimeExceptions for exceptions related with unencoded data.

RuntimeExceptions is the correct exception error source is the decoded data.

Note LogicExceptions as defined in PHP documentation implies a modification in the code by the developer.

> Exception that represents error in the program logic. This kind of exception should lead directly to a fix in your code.
http://php.net/manual/en/class.logicexception.php

But the token is a data provided by an external source which is out side of the control of the developer so there is no way of prevent malformed tokens.