Merge branch 'ampcamp4' of github.com:amplab/training into ampcamp4
Merge branch 'ampcamp4' of github.com:amplab/training into ampcamp4
Merge branch 'ampcamp4' of github.com:amplab/training into ampcamp4
add solution code section and minor updates
Merge pull request #131 from mengxr/ampcamp4

 Add solution code section and minor updates