Change version to 2.0.0-dev.
Migrate to Promises.
Fix bugs and refactor.
Fix code style.
Improve loading.
Fix code style.
Update documentation.
Update documentation.
Add space.
Improve formatting.
Improve documentation.
Add test coverage and coveralls support.
Add coveralls badge to readme.
Update coveralls badge.
Fix bug and increase test coverage.
Update readme.
Change version to 2.0.0.
Merge branch 'release/2.0.0'