initial functional tests - refractor argument parsing in class

[shepherdjay]

This is an initial py.test functional test. Mocking out requests with responses
In order to allow for testing needed to refactor the way the class processes arguments so that the arguments can be directly passed via a call to the class instead of parsing sysargs by default.

A separate function wasn't completely necessary but this allows clarity for where the arguments when invoking your class are.

Edit:
Fixes #2

[shepherdjay]

This is the result on my system of running py.test --cov:

tests\test_wtfuzz.py .

----------- coverage: platform win32, python 3.6.3-final-0 -----------
Name               Stmts   Miss Branch BrPart  Cover
----------------------------------------------------
wtfuzz\wtfuzz.py     108     24     44      8    71%

[mattjegan]

Looks awesome, I'll have to add a codecov and CI integration now 😄 Thanks.