Merge branch 'develop'
Merge pull request #2 from wizjin/develop

Add download media file.
Merge pull request #4 from wizjin/develop

Release v0.3
Add Travis CI
Merge branch 'develop'
Merge branch 'master' of https://github.com/wizjin/weixin
CI master only
Merge branch 'master' into develop

Conflicts:
	.travis.yml