Add extra test
Test fixes
Merge branch 'master' into author_answers

Conflicts:
	data/fileformats/reactions/formats/format_xdr.py
	data/fileformats/reactions/test/fixtures/system1.json
Respect unicode in mako
Merge branch 'master' into author_answers
Add to-string function for systems and reactions, use in tests
Merge branch 'master' into author_answers
Fix XDR bug