Make the linter stop yelling at me.
Merge pull request #12 from johnb30/inputs2

Make the linter stop yelling at me.
Add requirements file. Work on XML input.
Work on XML input format.
XML format and validation suite.
XML input for non-validation events.
Update README. A bit of cleanup in petrarch.py.
Actually update README.
Coding and writing issues.
Merge pull request #13 from johnb30/inputs2

XML as an input format