Update documentation link in README
Merge pull request #8 from garyburd/patch-1

Update documentation link in README
fix method SetBase error
Merge pull request #11 from jingzhaoyang/master

fix method SetBase error
Add base rrdcached support for `graph' and `xport'
Merge pull request #12 from vbatoufflet/rrdcached

Add base rrdcached support for `graph' and `xport'