renamed package from client to orchestrate. 

Ian, 
I've been playing with the golang orchestrate package and wanted to make a recommendation to change the name from client to orchestrate.  

It will likely save you some hassle in the future and will be more descriptive for folks using it.  

The standard naming conventions I have seen for packages:  

repo: go-<appname> , in your case it would be go-orchestrate. 
package: either orchestrate or go-orchestrate.   



Thoughts?  


Sean