Added the Metadata class to get/update the worksheet name and size
Added the autoSize option to the send() method, which enables to increasy the worksheet automatically when the cell is out of the current size
Update README.md with the metdata doc
Update README.md with new send() API
Merge pull request #8 from IvanGuardado/stable

Worksheet Metadata
new metadata and auto sizing features
docs
unused
Merge branch 'stable'

Conflicts:
	README.md
	lib/index.js