Upgrade gevent to 1.0
[#63935016] Add thread-safe i18n functions
[#63935016] Unit tests for i18n
Add domains and minor bugfixing
Add i18n functions for domain and session checks
Fix mock objects for i18n tests
Improve test coverage for i18n
Apply pep8
Update version to 0.1.8
Add babel to requirements
Merge pull request #79 from hermanschaaf/threadsafe_i18n

Threadsafe i18n
Hotfix: add Babel requirement to setup.py