- Updated assignments README to specify that code reviews are to be turned
  in via Piazza
- Clarified Step 2 in Asgn1
- Updated the syllabus to specify that code reviews should be turned
  into Piazza
- Updated the assignments README with additional information on accepted
  refactorings
- Added missing jars that were left out due to an incorrect .gitignore
  file
- Cleaned up a stray library reference
- Clarified and simplified step 1
- Changed dispatching of SMS events to be asynchronous to improve
  performance