Fix presumption in comparision used by 'sum', 'extend', and 'roles' exercises #108
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This fixes #106 "Sum Verification Problem"
In fact, it's not just the "sum" problem that is broken, but also "extend" and "roles".
The solution comparision relies on the output of the exercise being identical to the output of the official solution. However, seneca responds with various "meta" fields, such as the timestamps "start" and "end" which can be expected to be different with every call. Presumably these particular "meta" fields did not exist at the time the tutorial was written. To restore desired function and correctly compare the results we pick just the fields from the 'meta' object that do stay the same.
I have sucessfully completed the course, and as such believe I have removed all the bugs preventing students from doing so.