Fix redundant parameters without removing fields

[zanetworker]

• Removed the fields parameter from options in the handler before passing it to the delgates.
• Added an extra exception for checking options validity.
• Added the necessary checks in the delegates.

[zanetworker]

This closes #33

[motine]

thanks for the quick commit. Two comments:

• can you use the existing pop method instead of adding the new remove_dictionary_element.
• Also there is a file called gen-certs.sh~...

[zanetworker]

@motine Yes tom, I could use the pop method, but I did not want anything to be returned (pop returns the value of the key poped), therefore I created a remove method.

[motine]

cool stuff. you can always ignore the return value... Two more things:

• Matt added a method which is called fetch_fields, what if we rename this to pop_fields, so we remove the fields in there. Now it seems tedious to first fetch and then pop.
• the options_validity_check was good for testing, but I would recommend removing this now. Reason: I think the Delegate should rely on the fact that the Handler correctly created the fields and options parameter. The Delegate should not have to check these parameter again.

Keep up the good work. Even if it seems tedious what we are doing here. It is worth it!

[zanetworker]

Totally agree, at least now it make sense to use pop :)