Merge pull request #11 from pyexcel/dev release 0.6.1

Merge pull request #8 from pyexcel/dev release 0.6.0

🥚 🎡 release 0.4.2. related to pyexcel/pyexcel#105 

🤝 take latest code from setupmobans and release 0.4.1 🥚 🎡, which carr… …ies LICENSE file, pyexcel/pyexcel#103

release v0.4.0 

release 0.3.2 

release v0.3.1 

update changelog 

documentation update