Merge branch 'release/0.2.0' into develop

* release/0.2.0:
  bump to v0.2.0
ignore .travis.yml
fix scope problem in do-interval and do-timeout
bump to v0.2.1
Merge branch 'develop'

* develop:
  bump to v0.2.1
  fix scope problem in do-interval and do-timeout
  ignore .travis.yml