-r requirements.txt
coveralls>=1.0
mock>=1.0.1
flake8>=2.1.0
tox>=1.7.0

# Additional test requirements go here
lxml>=2.3.3

-r requirements.txt
mock>=1.0.1
flake8>=2.1.0

# Additional test requirements go here
lxml>=2.3.3

Install coveralls by tox, added tests for str representation, drop tox in requiements-test.txt
Install coveralls by tox, added tests for str representation, drop tox in requiements-test.txt
