CLC-1371 Re-factor Grade Postings in Canvas Activities
https://jira.media.berkeley.edu/jira/browse/CLC-1371
CLC-1371 Append message and score to graded assignments
CLC-1371 Re-factor Grade Postings in Canvas Activities

- String interpolation instead of concatentation
- Use .first rather than [0]
- Use .select instead of looping
Merge pull request #921 from shacker/CLC-1371b

CLC-1371 Re-factor Grade Postings in Canvas Activities