add simplecov dependency

adds coverage for 100% on most source files

add simplecov dependency

Add simplecov to specs

WIP add complete spec coverage

Revert "adjustments to remove launchy dependency in specs"

This reverts commit 794571016c75906ae8371593a201aa8f684f92ee.

Conflicts:
	README.md

specs for error middleware; make use of tacokit error classes

additional spec coverage for authorization
Merge pull request #1 from rossta/simplecov

add simplecov dependency