[CLC-922] Fixing timeshifting issues

https://jira.media.berkeley.edu/jira/browse/CLC-922

Should be able to deal specifically with the -5 error:

1) MyTasks should load nicely with the pre-recorded fake Google and Canvas proxy feeds using the server's timezone 
     Failure/Error: this_week_counter.should == 0 
       expected: 0 
            got: -5 (using ==) 
     # ./spec/models/my_tasks_spec.rb:76:in `(root)'