Update activerecord-userstamp to version 3.0.4
Update activerecord-userstamp to version 3.0.4

Fixes table name caching problem caused when inferring the name of a
nameless table or with empty string.
ActiveRecord will then use that empty name, even when it is set later.

cysjonathan/coursemology2,harryggg/coursemology2,BenMQ/coursemology2,BenMQ/coursemology2,Coursemology/coursemology2,harryggg/coursemology2,cysjonathan/coursemology2,Coursemology/coursemology2,xzhflying/coursemology2,Coursemology/coursemology2,harryggg/coursemology2,cysjonathan/coursemology2,Coursemology/coursemology2,Coursemology/coursemology2,xzhflying/coursemology2,xzhflying/coursemology2,Coursemology/coursemology2,BenMQ/coursemology2,Coursemology/coursemology2