Tests dir
Status code tests
Added mock library
Typo
Added coverage config file
Added a set of tests

Added tests for:
* shiva/__init__.py
* shiva/app.py
* shiva/config/__init__.py
* shiva/exceptions.py
* shiva/http.py
First indexer test

Not sure this is a unit or integration test, but serves as a placeholder for
future indexer tests.
Merge pull request #101 from tooxie/testing

Testing!