Modified: Rename from domain to domainName. 

# Rename from domain to domainName.

![2014-04-12 16 27 40](https://cloud.githubusercontent.com/assets/72997/2686648/08ed1c14-c214-11e3-9180-130be9127e0a.png)

Because domain is conflict with name of the domain module by node v0.8 or later.
http://nodejs.org/api/domain.html